This is my fix for the Industar-69 28mm 1:2.8 pancake lens famous infinity focus problem. I read several tutorials and pieced them together and came up with this non-destructive hack that still allows an infinity stop and close focus stop with only one minor setback of the aperture scale mark.
I used a digital camera for this fix which I suppose 90% of the uses for this lens is but, if you have an old 35mm film camera with the M39, Leica screw mount (with a hinged or removable back plate) you can use this lens too, just use a frosted glass plate of some kind, a removable SLR focus screen works good, or I’ve even used scotch tape pulled tight over the film guides to focus test lenses.
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