Omega #421-933 Extended Lens Plate with 50mm Thread

Omega #421-933 (formerly #421-133) extended lens plate with 50mm threaded collar typically used to mount 135mm and 150mm enlarging lenses with 50mm mounting thread on the Omega D-5 and D-6 lens turret or #421-107 Slide-In Lens Mounts, or D5500 turret. For specific D-5 / D-6 applications for this lens plate, please refer to our D5/D6 Lens Mount Reference Chart. For D5500 applications, see our D5500/ProLab II Lens Mount Reference Chart.

Since this lens plate is threaded, it's quite likely that when you screw the lens into the mount, the aperture scale will not end up facing you when the lens is is mounted on the enlarger. For this reason, we include a set of four shim rings (not shown) that can be used to adjust the position of the lens so that the aperture scale is properly oriented.

Supplied with 2 special thumbscrews required for mounting.