Originally Posted by
cgrey2
Thanks so much, Bob. And if I can ask a follow up question: I've measured the distance between the frame that holds the lens board and the frame that holds the ground glass at each corner, and the two planes are not perfectly parallel at the zero detents. The maximum deviation is about 1.5mm. Focusing on a test target from a distance of 7 feet at 5.6, there doesn't seem to be any practical problem with this as all 4 corners and center look sharp when examined with a 7x loupe on the ground glass. Is there any way to reset or calibrate the zero detents -- or is this something I just shouldn't worry about?
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