53mm Threaded Lensboard for Beseler 4x5 Enlargers

4"x 4" solid aluminum lens boards for use on Beseler 4x5 enlargers, including the 45M, 45MX, 45MCRX, 45MXII, 45MXT, 45V-XL, and CB7. These lens boards are threaded to accept lenses with 53mm mounting thread, such as the older style EL-Nikkor 150mm lens and certain Fujinon enlarging lenses. Please check the thread diameter of your lens. Since the lensboard is threaded, no retaining ring, jam nut or mounting flange is required.