39mm lensboard with 5/8" recess for 23C, 4x5, and 8x10 series enlargers. Accepts 35mm-40mm lenses.
Special Note: All Beseler 45MXT enlargers require item #8022 Recessed lensboard when using a 50mm enlarging lens and 35mm film. This is due to an improved bellows design. The standard flat Beseler lensboard #8023 or Delta Bes-Board #42245 can be used for other enlarging lenses with standard 39mm leica thread.