Agx is correct but there are caveats
The Fed1 and Zorki I are Leica II clones and it would be difficult to change speeds before setting the shutter but you can do double exposures easy.
Kievs are like Contax II before or after is ok but if you do it before you can minimise ribbon wear with some speed changes - don't ask. I can't recall easily
If you don't have slow speeds and have a dial with the pointer on the dial it is ok but dont use force and don't go the long way round there is a stop
If you do have slow speeds there is a stop where you would not expect it don't use force before or after.
It is simpler to wind on immediately and not use force.
There are felt less cassettes for Kievs and the LTM bottom loaders but there may be incompatible variations - not found any myself.
There is total compatibility/interchangeability between the Kiev and Contax II cassettes - the cassettes and bodies are clones.
The Fed and Zorki I are built to the Leica LTM standard for cassette size so there is 2mm of axial freedom with commercial cassettes, in theory but not had a slip yet though.
Some ERC have slots for credit cards, cept you wrote the exp notes on them in pencil.
The lenses all need hoods cause they are all single coated - Nearly.
My favorite is a toilet seat Fed I ('36) although it's lens is uncoated it holds it's own against post war lenses.
The Fed1 and Zorki I are Leica II clones and it would be difficult to change speeds before setting the shutter but you can do double exposures easy.
Kievs are like Contax II before or after is ok but if you do it before you can minimise ribbon wear with some speed changes - don't ask. I can't recall easily
If you don't have slow speeds and have a dial with the pointer on the dial it is ok but dont use force and don't go the long way round there is a stop
If you do have slow speeds there is a stop where you would not expect it don't use force before or after.
It is simpler to wind on immediately and not use force.
There are felt less cassettes for Kievs and the LTM bottom loaders but there may be incompatible variations - not found any myself.
There is total compatibility/interchangeability between the Kiev and Contax II cassettes - the cassettes and bodies are clones.
The Fed and Zorki I are built to the Leica LTM standard for cassette size so there is 2mm of axial freedom with commercial cassettes, in theory but not had a slip yet though.
Some ERC have slots for credit cards, cept you wrote the exp notes on them in pencil.
The lenses all need hoods cause they are all single coated - Nearly.
My favorite is a toilet seat Fed I ('36) although it's lens is uncoated it holds it's own against post war lenses.