Vologda 200mm f4 Jupiter-21M for M42 Filter Type_UV which is to say that

which is to say that it's not just a terrestrial camera in a bulky housing

Riken plastic slip-on lenscap for select Ricoh TLR cameras

Leitz FOOBD graduated green filter for A36 slip-on mount

Olympus OM-4 with a good Olympus OM F

Vologda 200mm f4 Jupiter-21M for M42 Filter Type_UV which is to say thatThe Vologda 200mm f4 Jupiter 21M lens is a heavily built telephoto lens, with a metal barrel and a built in retractable lens hood. Its designed for use on M42 mount cameras, and though it has a manual autodiaphragm switch, both work as a manual diaphragm. Not ideal, but totally usable. Optics are clean, and focusing action is nice and smooth.