Minor details.
So aside from fact that switching inserts will take longer than switching backs and that the insert will not match the backs, there is no reason to switch inserts instead of switching film backs.
- The inserts will not match the backs.
- Once the insert has been used, the photographer will have to crank to the end of the roll before removing the back.
- Once another insert is inserted, the photographer will have to crank the film to the starting position
Steve
Not really. For starters, the OP is using a Contax 645. As far as I know this automatically winds the film to the first frame and spools it completely once finished. So in this case, you really do only need to change the insert and everything else is done by the camera.
The insert/back sequence changes from system to system, but with my 501CM and the PM90 on it is much easier to quickly wind (1-2 sec), swap insert, wind again and shoot than put the darkslide in, swap the back and then take the dark slide out and put back in the holder/bag. Swapping the insert vs the back may or may not be faster on the Contax, depends how the back attaches and what steps need to be taken, the OP needs to try it (and really should have more than one back anyway).
As for matching inserts, that's a Hasselblad thing (true or not is irrelevant), I haven't found such "matching insert" talk for any other system, certainly not for Contax which promoted their vacuum cleaner
