This is the thick (13/16" thick) supplementary lens that must be installed in the lamphouse in Omega B-series condenser enlargers, including the B-3, B-4, B-5, B-6, B-7, and B-8, when using a 50mm lens to print 35mm and smaller format negatives. The flat edge on the lens allows you to insert your finger to make removing the lens easier. Refer to the enlarger manual for further instructions regarding positioning and use of the supplementary lenses. Omega part #472-012, Simmon part #4217
The used condensers may have cosmetic marks from previous use, but are in perfect working condition. They have no blemishes, chips or scratches which will affect usage.
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