Formed oval lens plate to mount certain 39mm Leica mount enlarging lenses on the Omega D-5 and D-6 lens turret or #421-107 Slide-In Lensmount. The slight extension on this lens plate is useful for situations where the rear element of a lens extends too far if mounted on a flat plate. For specific applications for this lens plate, please refer to our D-5 / D-6 enlarger Lens Mount Reference Chart. These lens plates are not threaded - a 39mm retaining ring is required to mount the lens - available separately if required.