Beseler 50mm f/2.8 HD Enlarging Lens for 35mm

State-of-the-art 6 element lenses feature illuminated aperture, pre-set diaphragm and removable full and half-stop detents plus multicoated 39mm (Leica) mounting thread. Includes lens cap and jam nut.

For 35mm format, use lensboard
Specifications
Elements/Groups 6/4
Recommended Film Format 35mm (24x36mm)
Mount Thread size 39mm
Aperture Range f/2.8-16
Full/Half Click Stops Yes/Yes
Filter Thread size 40.5mm (Lens cap is included)
Magnification 2x-15x (10x optimum)
Pre-Set Aperture Yes
Dimensions 43.5 x 50mm