btw, I just shot a roll of film using my 500ELM w A12 back & borrowed lens, the 120 film like at frame 12 cant fire the shutter. Then when opened up, the film is yet to be fully rewinded ... is it my A12 back or is it inherent problem by A12 back? Kind of wasted my frame 12 & might even spoilt my frame 11 picture
Please advise methx alot
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Try running a few shots without the back and see if the you have any issues. Alternatively would be to get a test roll and run through to check if the entire roll goes through the back without any issues.
Of course a quick DIY B&W development is the best way to confirm. Make sure your film tension is tigher too, when you load the film. Check for the spacing between the frames if they are consistant.