Flat lens panel for De Vere 500 series enlargers, including the 504, 507, 5108, 508H, and 515. These lens boards are threaded to accept lenses with standard 39mm "Leica" mounting thread. Lenses can be mounted directly on the lensboard without the need of a lens flange, jam nut or retaining ring. For lens mount information for specific enlargers, please refer to our DeVere Enlarger Guide website.