The Rodenstock 39mm Thread Metal Jam Nut is a retaining ring used to secure an enlarging lens with a 39mm thread to an enlarger lens board.
UPC: 053661030305
The Rodenstock 39mm Thread Metal Jam Nut is a retaining ring used to secure an enlarging lens with a 39mm thread to an enlarger lens board.
In adding an 80mm lens to a 3-lens turret for my Omega D5-XL, I needed this nut to lock the lens to the mounting plate. It works as specified. As always, quick delivery by B&H.
I am using several of these jam nuts to make my own macro lenses using my now somewhat obsolete enlarger lenses. Enlarger lenses DO work as macro lenses when properly distanced from the imaging sensor of new digital SLR cameras. These jam nuts fit most enlarger lenses, and are strong enough to hold the lenses in a horizontal position, as opposed to the usual vertical arrangement.