Another analogue newbie question here hehe.
On a contax 645, which has removable backs, is it safe to change backs mid-roll.
The backs have a dark slide that needs to be engaged before the backs can come off and I presume this is adequate to prevent any light from exposing the film??
Also, would it also be safe to assume when I'm done with the other back and put the original one on, I can just resume shooting from where I left off.

Also.. developing my first roll this arvo. Got myself a patterson tank, D76 developer, Kodak professional indicator stop bath, Ilford Rapid fixer, Photo-flo 200, some clips and a thermometer. Still need to get some measuring cylinders.
Anything else I'm missing?
btw: how do you store the chemicals once you're done. The guy at the shop said the developer is only used once but the stop bath and fix can be reused - is that right.