For a long time I believed that the aspect ratio of a camera was not really important, since you could always crop the print to whatever shape worked best. Then I acquired a Mamiya TLR, and proved myself wrong: I found the square glass quite inspiring, giving me a bright new view of the world.
I'd like to try masking my 8x10 down to 8x8, since maybe I will benefit from a square outlook: just cover up two strips of 1x8 on the ground glass, expecting to crop to square in the darkroom. What are the best materials and method for doing this? Of course it has to be able to go on and off repeatedly, easily, with no damage to the camera. I don't require absolute precision.
TIA,
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