The Retina Automatic III has most of the features of the Retina IIS (which is a IIIS with a non-interchangeable Xenar). Both are well made and attractive, having sharp four-element Xenar lenses, very good VF/RF, manual control of speeds and apertures, built-in meter, and flash-sync. But most people avoid the Automatic III because it’s unreliable — most examples are inoperative. Also, its auto-exposure mechanism makes the camera too noisy due to a crude escapement at the back of the shutter, and the firing lever for the shutter requires much force to press, increasing muscle-shake. Those of us who are getting older already have too much shake; we don’t need more.
This article describes a modification that (1) removes and bypasses the auto-exposure mechanism, (2) makes the camera quiet, and (3) makes it much easier to fire. After these changes, the Automatic III will be identical to the IIS except for the lack of slow speeds, self-timer, M-sync, and LVS (representing an advantage over the IIS).
In fact, the lack of LVS makes this modified camera easier to use than the IIS, IIIS, the Reflex models, and the IIc/IIIc/Ib folders. On this camera, you directly set the shutter-speed and f-stop. The meter suggests an f-stop based on your shutter-speed, which you might wish to ignore if the selenium cell is weak. If you want to change those settings without changing exposure (maintaining constant EV), you simply hold both rings and move them in tandem. Focusing is easier than almost all other Retinas because you hold a knurled ring instead of a tab. The front-release makes the camera easier to handle than the common top-release because you can rest the camera on the remaining three fingers, thumb in back, forefinger on the release. That’s a more comfortable position than a top-release camera; try it. Having the viewfinder on the left side means that a left-eyed person can use the camera without his nose bumping his thumb. The Retina IIF is an upscale model of the Automatic III, but the IIF suffers from a centered viewfinder, so nose bumps thumb, and its RF-base is 24 mm versus 36 mm in the Automatic III, making focusing noticably more difficult. No other Retina is as convenient and well thought-out as the modified Automatic III. No other Retina has such good ergonomics.
Because it has the best ergonomics and is built with traditional Retina-quality, I think the Automatic III is among the most desirable Retinas — but only if it’s been modified.
The Retina Automatic III was manufactured in two major variants. The second version has a longer meter cell than the first, making the variant obvious. I have found that meter cells in first version cameras are usually dead, while most meter cells in the second version are alive and appear to be close to accurate. Also, the second-version cells are more sensitive. Evidently, Kodak used a better cell in the second version. In addition, the second version added the annoying frame-1-lock feature found in the folding models that cause the frame-advance to lock when the frame-counter reaches 1. Kodak foolishly added this expense at a time of intense price-competition with Japan. Also, based on the serial numbers I’ve seen, it appears that late in production Kodak changed the advance-lever casting and put a plastic tab on it. In all variants, the rewind shaft is made of plastic, and the rewind knob cannot be raised for rewinding, making rewinding significantly slower than the folders. To my surprise, this raiseable-knob feature was also removed from the IIIS and IIS. The rewind knob was made thicker presumably in a feeble attempt to make rewinding less frustrating.
My overall assessment of this camera is that it is well designed and well made, with the glaring exception of the automatic mechanism which is overly complex for what it does and which makes the advance lever too hard to push. The modifications below fix these flaws by removing that mis-engineered mechanism.
This page is intended for experienced camera repairmen, so it does not explain how to perform common chores such as peeling leatherette. As an aside: Be careful when cleaning the focus-scale of this camera. I cleaned one with Fantastik, which to my amazement dissolved the paint on the focus-scale on the focusing ring, removing some of its numbers. Even water rubbed off some paint! Kodak must have used poor paint on the focus-scale because I’ve never had this problem on any other kind of camera. All other paint on this camera is fine.
You first must remove the top of the camera. Here is the procedure:
I have seen too many cameras with damage on and around screwheads, such as this example. When I see this, I say, “Uh oh, a slob has mangled in here.” Don’t be that slob. First practice on a junker until you are skillful and have learned to be careful.
If the meter is dead, you can cut the cord on the meter, and remove the spring and
the two small pulleys at the top of this photo.
But if the meter is alive and you wish to use it, use a felt-tip pen to mark the cord by the cord-lock screw. You will use this mark to maintain the original meter calibration upon re-assembly. However, I suggest replacing the original cord (made of cotton or somesuch) with braided fishing line, which is considerably stronger and probably not subject to deterioration. Remove the cord-lock screw, and unstring the cord. Remove the two small pulleys.
This “plate screw” holds down both one side of the meter and the support plate
for the rack. Remove it. Unscrew the other screw (by the strap lug) securing the other side
of the meter, but leave it in place as it is trapped by the meter housing. Pull out the meter.
The camera’s front bezel assembly for the meter/RF/VF consists of a chrome pressing, a piece of glass, and a plastic decoration behind the glass. The meter is in one end of the chrome pressing. The pressing hooks to the body under the meter, and the meter has a plastic lip hooking it to the glass. Because bezel and meter are thus interlocked, it’s best to lift out the bezel assembly and meter together by putting two fingers over the front of the meter (and bezel), your thumb on the back of the meter (at the back of the camera), and lifting all out together.
Put the plate screw back in, as shown here. It’s important to support the plate so that
you can cock the shutter without damaging the rack.
Examine the rack and its pinion gear for damaged teeth. They are usually fine.
|The cocking rack in this camera is not secured properly, which is a defect in design that can cause racks to bend excessively near the end of the cocking travel, often causing their teeth to wear or strip. You can fix this problem by bracing the rack from behind its teeth. In this photo, I have placed a small washer for the screw securing the right support plate for the rack. I also bent the flat part of the washer down slightly so that more of its area would contact the back of the rack. If the chrome trim-piece lacks a cut-out for a washer here, you will need to remove some material from the trim-piece using a Dremel.|
|The advance lever is fully rotated, putting maximum force on this rack and pinion. You can see that the washer prevents the rack from flexing away from the drive-gear above it. Fortunately, the cocking-force in the modified Retina Automatic III is low enough that bracing its rack like this might not be needed. However, I strongly suggest bracing racks in all other models of Retinas with this design-defect, which include the Ib, IIc, IIIc, and IIIC. Here’s how.|
If teeth on the pinion are damaged (red circle), you can avoid them by rotating the pinion 180 degrees.
As seen in this photo, this rotation will use the still-new half of the pinion, avoiding
its damaged half. This trick is suitable for all rack-based Retinas, and it works because
Retina cameras advance and cock in a 180-degree stroke, thus using only half the pinion.
Also, I braced this rack with a sigma (at the bottom of this photo) because it is a more reliable kind of brace than a washer. This article explains how to make a sigma.
|If you remove the rangefinder, you will notice a small plate with a spring-loaded tab, and this plate-tab combo will be loose because it was secured by the rangefinder’s screws. Don’t discard it because (1) it raises the RF-assembly to the correct height, and (2) it covers a “Stop” message in the viewfinder optics.|
I noticed that the film-advance mechanism was redesigned for the Retina automatic family.
In particular, the one-way catch for the frame-advance is
different from folding Retinas, as shown here.
The loose disk on the right covers the new pawl-based mechanism in the middle.
The problem was that grease on these parts was thick enough that the tiny spring
you see pressing on the pawl could not move the pawl into engagement, so the shutter cocked
but the film did not advance. My solution was to wipe off the grease
on these surfaces so the pawl could move freely. Be careful with that
spring. Although it appears large in this photo, it is in fact tiny and
can easily fly away.
This camera has a very low serial number. I examined this mechanism in a later camera, and it has almost no grease in this area. Kodak learned their lesson.
If the meter’s window has not come loose already, it will someday because its glue
has become brittle. I suggest applying a tiny drop of Superglue at the five spots
marked by red dots. The glue will wick into the gap between metal and window,
securing the window. Superglue adheres poorly to chrome, so it mostly attaches
the plastic window to the residual original glue on the chrome. Therefore,
do not clean off the original glue. If there is no residual glue on the chrome,
I suggest using contact cement instead of Superglue.
If this meter window is cracked or missing, you can make a replacement by cutting a suitable piece from a flat section of common product-packaging. The clear plastic for such packaging is made out of PET, which works fine for this application. Get the thickest packaging you can find (generally for larger items). Glue this replacement window to the chrome using contact cement.
The next several steps show you how to remove a lever from the shutter.
The set-screws for the focus ring are concealed under a decorative ring that’s threaded onto the filter-threads. This ring has no spanner slots; the spanner slots you see in the photo are for the front lens element. This decorative ring can be removed with your thumbs, if you’re fortunate. Otherwise, you’ll need to use a rubber tool on it.
Upon re-assembly, do not tighten this decorative ring. Only screw it on snugly enough that it won’t loosen on its own. This reason to avoid tightness is that all the force from this ring is transferred to the three small set-screws shown below; thus, high force can damage the brass ridge against which they press. I have seen such damage.
After removing the decorative ring, the three set-screws securing the focus ring are visible (circled in red).
Warning: One of the plates is a rotating disk with gear-teeth on it. Note its position so that, upon re-assembly, you can maintain its original mesh with the gear that it turns.
|Inside the shutter, there is a long lever marked here in red. Using needle-nose pliars, bend this long lever at its left end by 90 degrees until it’s pointing up, as seen in the next photo.|
|Repeatedly bend the long lever back and forth at the bottom until it breaks off from metal-fatigue.|
|The long lever is shown here sitting on top of the shutter. It was broken off at the red circle in this photo. I had you break off this lever now so it would not press against a tab on the main-cam, which would rotate a part and ruin your gear-alignment upon reassembly later.|
|Optional: Instead of soldering in the brass pallet as described later, you can solder a section of this long lever instead. If you choose to do so, you will need to cut the long lever down to the shape shown here. The metal is soft, and can be cut with a small wire cutter. I prefer the brass pallet because, in my experience, solder adheres more readily to brass than steel.|
Re-attach the front rings and plates to the shutter until it looks like this. At this point
you will modify the body, and will return to the shutter later.
Warning: Be careful to maintain the original alignment of the gear-teeth in this photo.
This photo shows what I mean by “mounting plate” and “standard”.
On the body, the mounting plate can be removed by removing four screws, three of which are under the leatherette near three corners of the chrome standard. The fourth screw is hidden under the Kodak emblem at the upper right corner of the standard. This emblem is thin aluminum, and to avoid damaging it, I suggest applying acetone to it for 5-10 minutes to dissolve the glue under it. Then push sideways on an edge of the emblem with the sharp tip of a wooden or bamboo skewer. The emblem will slide sideways and come off. Here’s a brief article showing how to neatly remove this emblem.
The upper-left screw has a smaller screwhead than the others to allow it to fit partly under the black plastic trim. Don’t mix it up with the other screws.
After removing the mounting plate from the body, you will need to deal with the meter cord.
If you’re not going to use the meter, simply pull off the cord and discard it.
But if you decided to use the meter, and you wish to use the original cord,
you can tape the cord to the mounting plate to keep it from unspooling.
If you are going to replace the cord with braided fishing line, as I recommend, you will need to know how both ends of this cord are strung on the spool. While using a finger at the end of the loop to keep the cord taut and on the upper and lower pulleys, change the ASA to 10 (its lowest setting) and the shutter-speed to 500 (its highest setting). At these settings, the slot in the spool should be facing down (from the camera’s point of view). The cord should look like this and the next photo. There should be 1/4 turn on end of the cord leading to the upper pulley, and 1.5 turns on the end leading to the lower pulley. If there is not 1/4 and 1.5 turns on your spool, then your camera has been tampered with.
Here is another view of the spool and cord. You can see that the end of the cord leading
to the lower pulley has 1.5 turns.
Each end of the cord has a little knot which keeps it from slipping out of the slot in the spool. In two of my cameras, I measured the length of the cord as 207 and 208 mm between the knots (excluding the knots themselves).
|This RF coupling lever is supported by a little screw that is usually loose. Push the lever up and down to see if there is any play; if so, turn the screw with tweezers to remove the play. Whether it’s loose or not, I recommend securing this screw with a small drop of blue (medium strength) thread-locker (Loc-Tite). Take care to not get any thread-locker into the pivot.|
|Here’s a crop of a picture taken with a Retina Automatic III. What caused that flare on the bottom circled in red? It was caused by what I call “sill flare”. To understand this, recall that the film window, also termed the “film aperture” or “film gate”, is the 24-by-36 mm opening that film touches in the back of your camera, delimiting the image-area. This window has sills on its top and bottom that are a few mm deep, and light reflecting off these two sills creates the flare you saw. I know of three ways of eliminating such flare, described in this article. I have ground these sills down to 45 degree (or steeper) slopes using a Dremel. Because the shutter assembly is off the camera, you can more easily make this modification.|
|This is the back side of the mounting plate after removal from the body, and removing the cord. This is a different camera than that above; this one has a black mounting plate. Later, you will modify the small gear above the lens-opening.|
Remove the mounting plate from the standard and shutter.
The other side of the mounting plate has some parts on it related to auto exposure. Remove the horizontal slider at the top. Also remove the lever at the lower left. But it’s riveted on, so you’ll need to break off both parts of the lever, unless you wish to drill-out the rivet. I slide a screwdriver under each part of the lever, tilt it upward as far as possible, and then bend the piece back and forth until it breaks off from metal fatigue.
|Here’s the mounting plate after removal of those parts.|
|Don’t lose this light-blocking washer, if present.|
The next several steps describe some modifications to the body.
Remove the coiled spring on the bottom of the meter. Save it, because you will use it later for a different purpose. The black cap below the spring is a screwhead holding on the spring.
|Here’s the meter with the spring gone. If you intend to use the meter, you must defeat the trapped-needle mechanism inside the meter by pushing the shaft fully in, and locking it with a drop of Superglue applied at the opening, as indicated by the red circle.|
|You see three horizontal coil springs in this photo that are on shafts. Remove the two that are circled in red.|
|Doing so will require that you remove this shaft. Also remove and discard the sliding piece on the right end of this shaft (circled in red).|
Here are some levers involved with the auto mechanism.
The following steps will keep them out of the way.
Do not remove the spring connecting these levers,
as it will help keep the lower lever where you want it.
Place the coil spring that you removed from the meter onto the brass shaft at the
left-middle part of this photo (circled in red), and reattach the release shaft as shown.
Some cameras have a washer on the other shaft as shown. If present, be careful to not let it come off.
As seen in this photo, the spring from the meter can push the release shaft far to the right,
which will be a constant annoyance while working on the camera.
Here is a way to limit the travel of the release shaft. Circled in red is a long tab on the upper lever which you glued in place. Remove this long tab by cutting it off with a small wire cutter. Its soft steel makes cutting easy. Alternatively, you can bend it back and forth until it breaks off from metal-fatigue.
After greasing the appropriate spots on these shafts, cycle the advance lever
to advance one frame. For later variants of this camera, you will need to press on the frame-one-lock shaft a little
to unlock the advance. When advancing, you will see the frame shaft in this photo pop upward
(rightward in the photo) by about 2 mm. This is the cocked position of the advance mechanism.
Bend the upper auto-mech lever (which you glued down) so that the slider on the release-shaft leaves a fraction of a mm gap with the frame shaft, as shown.
|After pressing down on the release shaft (to take a picture), the frame shaft remains down, leaving the large gap as shown. Upon advancing again, you should see the frame shaft pop upward, leaving the tiny gap.|
|After removing the mounting plate earlier, this is what you’ll see on the standard. Remove the gear marked by the left red circle, and discard it. Pull off the gear, starwheel, and washer marked by the right red circle, but keep them and note which way is “up” for each of these three parts.|
|Here is a close-up of those three parts you’ll be keeping, in their correct orientation. The washer on the left should be curved upward. The middle and right parts should be nearly flat; when upside-down, you will see a hollow in them.|
The pin-assembly in the upper-right red circle is part of the auto mechanism. Remove it.
Note the exposure-communication shaft to the left of the release lever (lower-left red circle).
This shaft communicates the ASA and shutter-speed settings (combined) to the meter
via the three parts you just removed and the cord.
Check that the button on the release lever (at the right edge of this photo) is screwed on tight. This screw sometimes works loose.
|Unscrew the set-screw securing the red flash-sync wires, and separate those wires. Unscrew the three black screws marked with arrows in this photo, and remove the standard from the shutter. Removal might require substantial force if the standard has corroded onto the shutter. First twist to break the bond, and then wiggle off the standard.|
|Be sure to tighten these screws on the shutter-side of the standard. There is also a third screw near the bottom of the standard to tighten.|
Here’s the back of the shutter. Note the release lever to the left of the red
flash-sync wire. The photographer releases this lever, which causes
the geared ring to rotate, speed-limited by the pallet on top, setting the proper
f-stop, and at the end of its rotation,
the shutter fires via the long lever that you removed inside the shutter.
Remove the geared ring surrounding the back of the shutter, and the brass pallet above it.
The geared ring is gone.
In my experience, there are two causes of most failures of these cameras:
Move the f-stop ring on the shutter between 2.8 and 22 several times. The aperture should move accordingly, without sticking. If it sticks, you will need to service the shutter; I provide some tips for this near the end of this article.
After removing the pallet and perhaps servicing the shutter, you can reattach the standard and mounting plate.
The shutter and standard can be reattached as follows:
|As circled in red in this photo, the release lever must slightly overlap the starwheel. If they are touching each other instead of overlapping, the mounting plate won’t fit on.|
|As you see here in the red circles, some teeth on these two gears can be worn. Before re-attaching the mounting plate to the standard, rotate these gears so that the end of the cocking-stroke, where mainspring force is highest, will be using teeth with little or no wear. Don’t forget to check where the gear at the end of the transfer shaft will mesh with this large gear. You will need a loupe when examining teeth for wear. The problem with worn teeth is they can make the advance stroke feel toothy — sometimes very toothy in my experience.|
The other side of the shaft labeled “pin-driven brass shaft”
has two tabs that rotate a slot on the shutter, cocking it. During the production
of this camera, a design-change shifted that slot a little, making it slightly offset relative
to the center of this shaft. Thus, this shaft needs to wobble a little during the cocking stroke to accommodate
the offset of the shutter’s slot. However, because you removed the geared ring
a few steps ago, this shaft will not return to its original position on its own after cocking.
Firing the shutter would return it, but rotating the mass of the shaft would slow down the high speeds.
Therefore, you should solder a piece of wire to the brass shaft as shown, causing the shaft to
return when the steel gear returns.
You must orient the shaft and gear such that the clockwise side of the gear’s arc touches the steel pin pressed into the shaft. This is the orientation during cocking.
To allow the shaft to wobble, it’s important that neither the wire nor solder touch the gear. The small gap between the arc and wire is harmless. Apply grease to the steel gear at the two locations shown to prevent solder from adhering to those surfaces. I suggest sanding the brass surface to remove oxidation before applying soldering flux to it.
Here’s a top view of the soldered-on wire.
Cut the wire after soldering it, allowing you to hold it while soldering.
I used ordinary telephone wire with a diameter of 0.6 mm. Any solid copper wire
around this diameter should suffice.
If any solder is above the top of the brass shaft, file it down to the level of the shaft so that it won’t touch the light baffle which is close to the shaft and gear.
The pin and wire together trap the arc between them, causing the shaft to follow the gear in both directions, while allowing the shaft to wobble. Force on these parts is very low during the return-portion of the cocking-cycle, so the solder joint is more than strong enough.
In preparation for reinstalling the mounting plate on the body, position the gear and shaft as shown in this photo. The arc should be centered either directly above (as pictured) or directly below the shaft, with the pin touching the clockwise side of the arc. This orientation causes the tabs behind the shaft to mate with the shutter’s slot.
|Before placing the mounting plate (and shutter assembly) back on the body, consider removing the release knob from the end of the release lever, bending the lever up a little and covering it with heat-shrinkable tubing as shown. When bending the lever, take care to not twist the portion of this part that is under the standard. The tubing will probably slide off the lever too easily. To prevent this, pull it off the lever, put a little contact cement inside the tubing, and press it back onto the lever. Also, I painted the exposed portion of the lever black to match the tubing. An alternative I haven’t tried is to dip the end of the lever in black Plasti Dip (liquid rubber). Plasti Dip is also useful for plugging holes in curtains and light-leaks in bellows. You can also paint the lever, but the sharp edges bothered my finger, so I prefer the rounded edges provided by tubing.|
|You might find the camera to be more attractive without the conspicuous release knob protruding to the side of the standard.|
At this point, if you are going to use the meter, you should put a droplet of oil
at the spot shown to help the sleeve rotate as the cord runs over it.
Note the angled-tip tool in this photo. This tool will greatly help in stringing the cord, so much so that I regard it as an essential tool for this part of the job. The sharp tip is only 4 mm long. If you lack this tool, you can probably make one by bending a piece of coat-hangar wire and filing/grinding the end into a sharp point.
I recommend replacing the original cord with braided fishing line.
I got fine results with lines having diameters of 0.31 and 0.32 mm, both 4-strand and 8-strand.
Line braided with 8 strands is preferable, but 4 strands will suffice.
In this article, I used a 208 mm length of the following fishing line:
Mounchain Extreme Braid 8 x 300M 40LB 0.32MM.
I have also used the following 4-strand 0.31 mm line with fine results:
Kastking KastPro Braided Fishing Line 40LB 150YDS.
I have not tried any other kinds of fishing line,
except that I first tried a 0.4 mm diameter line, which was slightly too large.
If diameter is not specified on the package or website,
select a fishing line with a strength of 90 to 110 kg (40 to 50 lbs).
If the line you want is out of stock, try selecting a different color.
On amazon.com, I find that some colors are usually in stock.
Also, 8-strand might only be available in certain colors.
You need 208 mm of cord, with knots on both ends to secure the cord to the slot in the spool. You can tie knots 208 mm apart, but it’s difficult to position a knot accurately, and you must do something to prevent the knot from slipping off the end of the cord. Instead of using knots, you can make a replacement cord from braided fishing line by cutting your line to 220 mm (220=208+6+6), and then holding each end to a hot soldering iron to melt 6 mm of line into a molten blob, reducing the length to the desired 208 mm between blobs. Important: hold the end of the line to the iron, so you will be melting it end-first. The blob at the end will grow as you continue melting. Also, the blob never touches the iron. The heat a fraction of a millimeter away from the iron melts the line, causing it to withdraw from the iron as it’s melting, so the two should never touch. The blobs are large enough that they will not pull out of the slot in the spool.
Attach the meter cord to the spool and pulleys on the mounting plate. Set the ASA to 10,
shutter-speed to 500, and double-check that the slot in the spool points down.
Then carefully thread both ends of the cord exactly as pictured in the disassembly-steps above.
After stringing the cord on the mounting plate, hold it in place with a piece of cellophane tape, as pictured here. Keep the tape well away from the edges of the mounting plate so it will not get trapped between the mounting plate and body. Also keep it away from where the cocking pinion will be located (just behind the cords in this photo).
Attach the shutter assembly to the body as follows:
|When placing the shutter assembly back onto the body, it’s nearly impossible to get the cocking gear pin aligned with its hole in the mounting plate. But with the meter removed, enough openings will be uncovered on the top of the body that you can see where the transfer shaft is located (red arrow), and you can move it with an angled-tip tool to position it correctly. In this photo, you can see part of the large gear to the left of the gear at the red arrow. You can rotate that large gear a little with your angled-tip tool to get those two gears to mesh.|
Looking down on the top of the camera,
check that the cords are passing over the pulleys on the mounting plate,
and that a cord is not off to one side or between the pulleys.
Also make certain that the two cords are not crossed.
You can look down the hole with a flashlight to check for crossing.
You can also check for crossing as follows: Rotating the shutterspeed ring
to a lower speed should move the cord closest to the lens upward; the cord
closest to the back of the camera should move downward.
Using cellophane tape, tape the cords to the top of the rangefinder or rewind shaft to keep them taut enough to stay on these pulleys.
Reaching down with tweezers, remove the piece of cellophane tape from the mounting plate that was holding the cords in place.
Try advancing a frame, which should cock the shutter. If the large gear above was rotated fully clockwise, you should not overcock the shutter. But it might be undercocked.
Remove rings and plates from the front of the shutter until its mechanism is exposed.
Be careful to maintain the proper mesh of the toothed plate and the gear it drives.
Cock the shutter using the advance lever. If you see that it does not cock far enough, peform the following steps:
Here’s the inside of the shutter, with parts labeled that you need to know about.
You removed the long lever several steps ago. In case you were wondering,
a rotating tab presses the top-end of the long lever, which in turn presses the
final fire-lever, firing the shutter.
You need to fire it from the main lever instead,
which is why you removed the long lever.
The final fire-lever directly fires the shutter. In the steps below, you will attach
an arm to the main lever which will move the final fire-lever, firing the shutter.
In this photo, you can see the retard mechanism on the right side of the shutter, with three of its parts labeled in red. In the middle of this mechanism, at the 3:00 position of the shutter, there is a brass spinner. I recommend that you clean and lube the bearing and axle of the spinner with moly powder and/or watch oil.
To put the spinner back, you must correctly position the return gear and its spring. Assemble any parts you removed from the retard mechanism, but leave the spinner out. Cock the shutter. Rotate the retard lever as far clockwise as possible. Rotate the return gear until the tail of its spring touches the shutter’s throat. Rotate it 1/4 turn more, and holding it in this position, install the spinner. To check the mechanism, rotate the retard lever as far anticlockwise as possible, and slowly release it. Even with such slow release, the retard lever should return to the maximum clockwise position, driven by the spring around the return gear. Fire the shutter while holding the B-lever (8:00 position) outward, and the speed should be 1/30th.
That 1/4 turn is what I’ve seen on multiple cameras, so I believe that’s what the factory used. However, you can reduce shutter speeds by rotating the return gear by more than the 1/4 turn recommended above, and likewise you can increase speeds by rotating it less. If you can measure speeds, I suggest rotating the return gear such that 1/30th has the correct time; the higher speeds should fall into place. But I’ll caution you against going much over 1/2 turn because I tried 3/4 turn on two cameras, and their mainspring was unable to (slowly) push the retard lever through its complete movement, which would jam the shutter.
The following steps solder the brass pallet to the underside of the main lever.
But first, you must clean that underside as follows:
|Here is the brass pallet you removed earlier.|
Cut or grind the teeth on the pallet until it looks like this. I used a Dremel for this chore.
Sand the end as shown, and tin it with solder. “Tinning” means applying solder ahead of time. Space is tight in the shutter, and if the thickness of this blob prevents this part from fitting under the main lever, you will need to file down the blob a little to make it thinner.
While soldering it, you will need to hold the pallet with angled-tip tweezers. Tying the ends together with
electrical wire as shown makes the delicate task of soldering easier because you won’t need
to constantly squeeze the tweezers.
I found that this trick eliminates all finger-shake while trying to solder.
In this photo, the tweezers is holding the long lever (cut to appropriate size) instead of the pallet. Both are suitable, but as I mentioned earlier, I prefer brass because solder adheres well to it.
Do the following in preparation for soldering:
In these cameras, the mechanism for the cable-release has slightly less travel than the release lever. Thus, if the critical gap is too small, you could probably fire the camera from the lever but not from a cable-release.
The following steps solder the arm onto the main fire-lever:
This kind of angled-tip tweezers is uncommon in the marketplace, but they’re invaluable for a chore like this.
Here is the result. At this point, you need to:
Watch out for any tiny remnants of solder lying about. Such bits are referred to as “FOD” in industry, which stands for “foreign object debris”. It’s deadly in electronics. It can only cause trouble in a shutter, so eliminate all FOD resulting from soldering.
After this modification, the main lever will fire the shutter, as well as close the blades on B (its original purpose). This modification works well. Advance and fire the shutter a few times as a photographer would, checking that both B-speed and cable-release operate properly. This is the kind of work you can be proud of.
By the way, this is how the shutter in the Retina IIF is constructed: Its main fire-lever has an arm reaching over to the final fire-lever, whose shape is nearly identical to the arm we just added.
To attach the arm, I used Superglue in the first cameras I modified instead of solder. The arm was pressed up against the main lever by a little piece of foam rubber under it (instead of tweezers). Superglue is strong enough, but solder is stronger, giving us more margin against failure, so I switched to solder. If your hands are so shaky that you cannot hold tweezers steadily, consider using Superglue instead. Epoxy should be stronger than Superglue, but I’ve never tried it.
You may now reassemble the shutter and lens assembly. Be careful to maintain the original
mesh of these two gears.
When installing the pictured brass retainer ring, note that the tabs on this ring should rest on the outermost (raised) surface as shown (marked “here” in the photo). If a tab is on the inner (lower) surface marked “not here”, the brass ring has probably not snapped into its mating slot encircling the inner wall of the shutter casing.
Re-install the meter.
Here’s a problem with the Retina Automatic III camera: The cable release at the top requires that the actuating pin at the end of the cable extend a long distance, and some cable releases might not reach far enough. You can reduce the required distance by placing a slug (spacer) in the brass tube below the release at the top. This tube has a diameter of 3 mm, so you need something a little smaller. Around here, hardware stores sell “hanging wire” intended for hanging false cielings, and this steel wire is 2.6 mm thick (10 gauge). That’s good enough. A suitable nail will also work. Cut a piece that is 5.5 to 6 mm long as shown.
Round the edges of your cuts (as seen in this photo) so that sharp steel edges won’t cut into the brass tube.
In this photo, I have placed the slug into the cable-release tube, which is part of the meter assembly.
It should protrude no more than 1 mm above the metal surface of the meter.
If you are not going to use the meter, then put the top-cover back on, check that everything works, and you’re done.
But if you need the meter, the following steps show how to restring the meter cord.
It is not possible to restring the cord over the studs and through the ends
of the spring, while the spring is pulling on the cords. After some
experimentation, I settled on the following steps for restringing the meter.
For a second-version camera (with the large cell): Being careful that a cord doesn’t hop off a pulley shown above, change the ASA to 100 and shutter-speed to 125. In the following steps, try to keep the opening of the large pulley facing straight down, as this position will be close to its correct calibration. I don’t know the calibration position for a first-version camera (small cell).
Use cellophane tape to hold the cords in place at the upper left corner of the meter. This photo shows part of that piece of tape. The cords run over the meter’s vertical pulleys (not pictured). As shown, install the left small pulley, but not the right pulley because it will get in the way when stringing the left pulley.
On the large pulley, arrange the cord as shown.
Hook the cord to one side of the spring, push it into the groove, and hook its other side.
Cut a separate length of scrap cord (yellow in these photos) around 15 cm (6 inches) long. Tie it into a loop, passing through the loop of meter cord as shown.
|Push the meter cord passing over the large screw into the bottom portion of the groove.|
|Using your angled-tip tool (pictured earlier), string the left cord over the upper left pulley.|
|Put on the upper right pulley, and string the right cord over it. This will stretch the spring and tension the cord. Now you can remove the tape mentioned above.|
|Calibrate the meter now, because at this point, moving the cord back and forth through the large pulley is easy. As part of calibration, center the spring in preparation for the next step.|
Install the cord-lock screw as follows:
|The restringing and calibration are done.|
|When reassembling the camera, you might have needed to remove the bottom plate, and if so, you need to reassemble the rotating spring-returned release-cover surrounding the tripod-mount. That tiny spring can easily jump away, but here’s a trick to reassembling it without losing this spring: Assemble the pieces on your work-mat as shown, with only one screw inserted as shown. Insert the spring last. Then pick up the assembly by only touching the round cover-piece, thus ensuring that the two large pieces stay together, and push the assembly onto the tripod mount. Doing so pushes the screw out some, but everything will stay together. When pushing on the assembly, keep the assembly in the orientation pictured here, with the screw pointing up, causing you to push the assembly up onto the bottom of the camera. Then tighten the screw in it, and then put in the other screw.|
You are done with the main modifications necessary to make the camera reliable and easy to use. I provide additional suggestions and information below.
It appears to me that the scaling adjustment in the rangefinder in this camera was calibrated to the focus scale and not to the lens. This adjustment determines accuracy of focus at close distances, and changing this adjustment can affect the infinity adjustment. I suggest focusing at a close distance using the camera’s rangefinder, and comparing that focus-scale number with what you obtain by focusing on a groundglass placed on the film-window. But you should check focus well off-center with your groundglass. The reason is that these lenses can have substantial curvature of field, with a hump in the center. Most lenses of various brands have a center-hump, so focus should always be checked off-center. If RF and best focus on groundglass are substantially different, then the rangefinder does not match the lens at close distances. You will need to remove the top and change the scaling adjustment.
WARNING: Before changing the scaling as described below, first verify that the infinity focus of the lens is correct. Sometimes a dufus will change the focus adjustment of the lens using the three set-screws that secure the focus-ring to the lens. If you are certain that:
|This photo is looking at the front of the rangefinder, showing the adjusters and their locks for infinity and scaling. The locknut or lockscrew must be loosened some before adjusting. The infinity adjuster is an eccentric, and a slight rotation causes a significant horizontal shift, so rotate it only a tiny amount when calibrating for infinity. Another problem is that the scaling adjuster rotates when you rotate its locknut. This adjuster has two flats on it, one of which is barely visible in the red circle.|
|Here’s a better picture of one of the two flats. This is actually a Retina IIIC (big-C), which employs the same rangefinder design.|
|The solution to the problem of the rotating scaling adjuster is to hold it steady with a thin wrench that holds it by its two flats. You can make a wrench like this one by grinding a slot in a piece of spring steel with a Dremel equipped with a cutting wheel. The brass piece on my wrench serves no purpose; it was already on the spring steel and I didn’t bother removing it.|
|This is how you use the wrench to hold or rotate the scaling adjuster.|
|The metal for the shutter housing is prone to corrosion that produces white, salt-like crystals like this. If the camera has been in a humid area, there might be enough of this corrosion to cause the aperture to be frozen fully open. If so, you will need to disassemble and clean the shutter. The following are some important tips for this chore.|
|Here’s what the back of my shutter looked like. It’s no surprise that the mechanics were jammed.|
|You must remove the cocking gear, and unfortunately, it is pressed on rather hard. I lifted it off with two screwdrivers as shown. Important: To avoid denting the aperture ring, place bits of metal under the screwdrivers to raise them a little.|
Remove the rear firing-lever in the same manner. But if you cannot get the screwdrivers
under this lever, you can use a screwdriver to pull up on the main fire-lever
inside the shutter.
Now you can remove a rear ring and the aperture-setting ring. WARNING: There is a spring-loaded ball behind the aperture ring; take care not to lose it (as I did). This spring-and-ball provides stiffness for the ring and the click-stop for the A-setting.
|With that firing-lever gone, you can push out the main fire-lever inside the shutter, and prepare its underside for soldering on the new fire-arm. You will need to file down the blob of solder to be thinner than this example.|
WARNING: Nothing holds the aperture assembly to the shutter housing! So disassembly
and reassembly must be done differently than with most shutters. To disassemble, follow
The photo shows what you will see after lifting off the housing. The leaves for the aperture and shutter are not secured to the mechanism, so take care to not disturb it.
When reassembling, assemble the aperture leaves wide open, and place the rotor over them such that the pins are in the corners of the rotor’s channels, as seen in the red circle on the right.
|Lifting off the brass rotor reveals the aperture leaves. This photo shows that when you reassemble the leaves, you must (1) orient each leaf so that its two pins are on its anticlockwise end, and (2) assemble the leaves in anticlockwise order. Note that the aperture leaves rest on the stator plate.|
Lifting off the stator plate reveals the shutter blades. This photo also shows you the correct order of the blades.
When reassembling, start with the pins at the 9:00 position, and assemble the blades proceeding anticlockwise.
In the prior two photos, you might have noticed that one of the shutter blades has a curved band of scrapes on it (the large red circle). In this photo, we see why. The small red circle identifies a tiny piece of metal that somehow got into the shutter, and was scraping that blade. This metal bit is smaller than an ant, and yet it eventually caused the shutter to jam. In industry, such bits of material are called FOD — foreign object debris. They are destructive in both electronics and machinery. Take care to allow no such bits of FOD to drop into a camera you are servicing.
Corrosion. This is the inside of the housing that you removed, and corrosion on these machined rings will
cause the aperture rotor to be stiff and/or raised up slightly. Either will result in a stiff aperture.
Scrape off all this corrosion.
To remove the remaining corrosion on the housing, I cleaned it with detergent and a toothbrush. Doing so removed only the large crystals of corrosion. To remove all of it would require either a brush with stiffer bristles or a sandblaster. But removing the bulk of the corrosion with a toothbrush and hand-scraping the rotor-rings was good enough.
After cleaning those rings, place the rotor in the housing. It should rotate effortlessly through
its full travel.
After cleaning the parts, we now begin the process of reassembly. To reassemble the shutter, review the reassembly instructions mentioned in some steps above. I suggest you keep the mechanism on the small object mentioned above during the entire reassembly process.
|A problem when reassembling the shutter blades is that they tend to fall into the shutter’s throat. My solution is to position the blade-operating ring in the fully open position; the B-catch ensures that it stays fully open. Then I assemble the blades wide open as seen here. I apologize for thoughtlessly positioning this photo rotated 90 degrees with respect to the previous photo showing the shutter blades. Anyway, this photo also shows the correct placement of the blades: Start at the pins at 12:00, which will be the bottommost blade, and proceed anticlockwise.|
When reassembling the aperture, the final leaf must be slid underneath the first leaf you laid down,
which usually disturbs both it and the other leaves, forcing you to start all over. A solution is
to put a weight on the leaves near the anticlockwise-end of the final leaf. In this photo,
the leaf stretching from 12:00 to 4:00 was my final one, so I weighed down the leaves starting at 11:00.
The final step in reassembling the shutter is delicate: Carefully place the housing over and on the base, tilting the housing as necessary to avoid touching the tab projecting from the rotor, and to avoid interfering with the flash-connector on the interior of the housing. While manipulating the housing, it must not touch the rotor’s tab, as doing so will disturb the aperture leaves. This last step sounds difficult, but it worked easily both times I tried it, including my first attempt, so it’s not overly difficult. I suspect that this is how the shutter was intended to be assembled.
|The aperture ring pushes on only the right side of the aperture-tab, and we rely on a spring to keep the tab pressing against the aperture ring. But if the aperture has some stiffness, it might get stuck. It is stiffest wide open, so check that the spring has enough reserve force to reliably move the aperture at f/2.8. If it does not, you can create a bump in the aperture ring that will press against the left side of the tab, as seen in the right red circle in this photo. The left red circle shows what used to be a small wire cutter modified to compress metal between its jaws, creating the bump in the aluminum ring. You could also create the bump by placing the aperture ring between steel objects, and tapping one of them. Both techniques take advantage of the malleability of aluminum, causing it to flow outwards. You will probably need to file the side of the bump to yield a well-shaped slot for the tab. You can also create a bump at the top-left corner of the tab.|
When the camera is back together and working, go shoot some film!