39mm Threaded Lensboard for Beseler 23C & 4x5 Enlargers

4"x 4" solid aluminum lensboard fits all Beseler 23C and 4x5 enlargers, including the 45M, 45MX, 45MCRX, 45MXII, 45MXT, 45V-XL, and CB7. These lens boards are threaded to accept lenses with standard 39mm "Leica" mounting thread. Lenses can be mounted directly on the lens board without the need of a jam nut or retaining ring.