50mm Threaded Lensboard for Beseler 4x5 Enlargers

4"x 4" solid aluminum lens boards fit all Beseler 4x5 enlargers, including the 45M, 45MX, 45MCRX, 45MXII, 45MXT, 45V-XL, and CB7. These lens boards are threaded to accept lenses with 50mm mounting thread, such as certain Rodenstock and Schneider 135mm and 150mm lenses. Please check the thread diameter of your lens. The lensboard is threaded, so no retaining ring or mounting flange is required.