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Beseler 23c-ii lens board sizes
I bought a used Beseler enlarger. The lens board that came with it had a 50mm El Nikkor lens. An omega enlarger also came with the deal and it had an 80mm El Nikkor. I swapped the 50mm for the 80mm since I want to print 6x7 negatives. I was reading that there are different lens boards for different focal length lens ranges. 8021 would work for the 50mm and 8023 for the 80mm. I'm assuming I have the 8021 but there are no markings on it, just a pilot light.
How can I tell for sure which model board I have? Will the 80mm lens work OK with what I've got?
Thanks,
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Both boards are flat, the only difference is the counterbore location (front vs. rear). The counterbore is fairly minor, maybe 1mm, so at most it amounts to a 2mm difference in the lens location, which is basically nothing compared to the difference in focal lengths. I'd say use the board you've got and don't worry about it.
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There’s a list of Beseler 23C lens boards along with descriptions (counterbore locations) and catalog numbers on this site:
http://www.oresteen.com/bess23c.htm
The 80mm lens will work fine on the flat board (4” x 4” x 1/8”) with the 23C, 23C II, and 23C III. The 80/5.6 EL Nikkor will fit both versions: 8021 counterbore on front or 8023 counterbore on back.
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