yes, i know that already. i don't know why people keep bringing it up, like i've never seen an slr before. my mirror box needs to be (roughly) 4" tall, 5" wide, 4"-5" long (depending on how much of the mirror i can have sticking out into the bellows without hitting anything), a little extra length at the back to slot into the fp shutter and a 4"x5" raised section on top for the gg to match the depth of the fp shutter and back. i'm probably going to be limited to 180mm or longer lenses. order of operations is simple: check that the two ggs are aligned properly, load the film holder, set the shutter speed, pull the dark slide, frame and focus my shot with one hand then hold down the lever to raise the mirror and release the shutter with the other hand.
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