I'm a LF newbie so please, bear with me. I'm looking for an additional flat #0 lens board because the one that comes with my camera is recessed and attached to a SA 90mm/8 lens.
I'm watching what is on offer at KEH to get an idea of price level etc. but I find description texts baffling. Here's an example:
"CAMBO SC 42 HOLE LENS BOARD" or "CAMBO SC 39 HOLE LENS BOARD".
What are numbers 42 and 39 indicating?
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