Can I use Kiev 60 and Pentacon 6 lenses on a normal Kiev 88?
No, you can’t. The registration distance (distance from the lens flange to the film) is shorter on the Kiev 60 and Pentacon 6 than it is on the Kiev 88. To use a Kiev 60 or Pentacon 6 lens on a Kiev 88, the lens would have to be recessed into the camera body which is something no simple adapter can achieve. It would be possible to construct an adapter with an negative element in it which would allow use of Kiev 60 and Pentacon 6 lenses on a Kiev 88, however such an adapter is not known to exist. If it existed, such an adapter would probably be expensive and possibly degrade image quality significantly. The most common route taken is to change the mount on a Kiev 88 body, recessing it into the body and converting it to Kiev 60 breech lock mount (as in the Kiev 88CM) or to a Pentacon 6 bayonet “twist-and-lock” mount (Kiev USA and Hartblei). Without recessing a Kiev 60 or Pentacon 6 lens into the Kiev 88 body or without using a negative element, these lenses would not be able to focus to