39mm flat lensboard witha counterbore on rear for 23C, 4x5, and 8x10 series enlargers. Accepts 63mm-90mm lenses.
Special Note: All new Beseler 45MXT
enlargers require item #8022 Recessed lensboard when using a 50mm
enlarging lens and 35mm film. This is due to a new 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.