I do know that by the time the Leica IIIf came out, the cartridge length was standardized enough for Leica to take it into account - so that's what, 1950? At any rate, I've noticed it on both the Zorkis I own (Zorki 1 and 5, both bottom-loaders), but on none of the Feds I own (or have owned in the past - two Fed 2s, a Fed 4, and a Fed 5).
Easy enough to fix, though. I used some self-adhesive foam from a light sealing kit; a small disc on the baseplate is just enough to keep the canister straight.
David, that's an interesting list, but wouldn't bottom of canister to tip of center spindle be a better measurement?
I have a flickr
and a tumblr
, and it turns out that I'm terrible at maintaining both. But I try.
Every fortnight, I sit down and record some ramblings about film photography which gets uploaded to pdexposures.tv
Nate calls it a podcast. I call it a shambles. But we all have fun, and isn't that what counts?