Originally Posted by
reddesert
Measure the lenses' thread diameter. The standard is 39mm thread, but some older lenses (Schneider in particular?) have a 25mm or 32.5mm thread, and there are some really big lenses with a larger thread.
50mm will work for printing from 35mm, 80mm from 6x6, but you'll need a longer lens like 150mm to print from 4x5.
The 4x4 lensboards for 23C and 45 are the same. There are all sorts of slightly different shaped lens mounting areas. The ones with relief around the mount hole are to allow mounting a lens that has thread length too short to stick through the full board thickness. The ones with a spacer are to get more extension for a long focal length lens. The KHB Photografix site shows a bunch of these board types, although they don't have them all in stock.
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