Early Minolta SR-T: Silver ring around mount area

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David Lyga

Council
Joined
Nov 25, 2007
Messages
3,407
Location
Philadelphia
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35mm
The older SR-Ts have a narrow silver ring around the mount area that turns as the lens aperture is changed. Sometimes this ring does spring back so readily because of a build up of tiny debris or even light inner rust. It does not take too much of this to make the retraction too slow for comfort. (The more recent SR-Ts have solved this problem with a better designed plastic ring.)

First, try applying a tiny bit of lighter fluid, with the camera held so that the prism area faces upward (you do not want any fluid hitting the prism!). Let it drain from the bottom. If this does not work, it might be necessary to remove the ring and sandpaper it's inner circle so it will turn without any impediments. Doing this is only a bit tricky, but work carefully.

First unscrew the metal mount itself and remove it.

Then remove the mount PLATE, which first involves unscrewing the two bottom screws, just beneath the mount. Then remove the red dot screw (this is a bit tricky): Under that red dot tiny disc there is a normal screw, but getting that red dot disc is sometimes a bit difficult to pull out, even though it is not glued in or anything like that. What I have done is to take a pair of pliers and GENTLY turn, counter clockwise, this red dot screw (without marring the metal underneath). It does not take very much pressure to do this. After it is started, you can unscrew it with your fingers. Finally, remove the lens latch-lock screw (wider, rougher nut that is northeast of the mount area). This turns counterclockwise (as is normal) with a pair of pliers.

After those four screws are off, the mount plate can be lifted off without having to remove the top cover.

Now, it gets a bit tricky: The cloth thread attached to the silver ring must be gently removed (it slides off but be careful to do this gently or this thread might retract into the body). Take this narrow silver ring and clean it well, then, with a piece of sandpaper, rub its inner ring area around and around with the sandpaper, for a few minutes, changing the sandpaper area to maintain the paper's roughness. After a few minutes, clean the ring, again, thoroughly (I wash it and dry it.) Now you have to reattach that thread, perfectly, but first, make FIRST sure that the clean ring turns effortlessly when the mount ring is on top of it. Try this manually, without first reattaching to the SLR. This cloth thread must run along a tiny wheel's indentation (upper rightmost area of prism area).

The thread is run on that tiny wheel's indentation and MUST be kept there when putting everything back together. FIRST, make certain that the thread in in that wheel's indentation. Then, MAINTAINING the thread's tautness (without any slack that can allow the thread to jump from the top of the wheel) guide the thread along the RIGHT side of the lens lock lever, onto the silver ring's tiny slot and, without any dangerous slack in the thread's tautness, guide that sliver ring back into the mount area WITHOUT THAT THREAT SLIPPING OFF THE SILVER RING!!!. After successfully done, make certain that the ring turns easily and that the thread is securely on that wheel. Of course, the ring's tiny forward protrusion must be at the top area, in order to guide the lens's aperture guide. Make certain that that silver ring abruptly stops at the point that is about 10 o'clock (there is a metal stop that is just under the ring, and a VERY thin similarly sized ring underneath that has a tiny indentation that fits, precisely into the camera body's mount area). Then put back the mount plate, attach the bottom two screws and the red dot screw and the lens latch-lock nut. Then replace the mount itself, tighten its screws, and everything should work well. - David Lyga
 
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