Adapter for M39x0.75mm Enlarger Lens on Sony E Body

This is a simple focusing adapter that I made for my Rodenstock Omegaron 150mm f/4.5 enlarger lens to be used with my Sony E-mount cameras. This particular enlarger lens has a 39mm diameter thread with 0.75mm pitch -- beware that many enlarger lenses have different threads (including 39mm with 1mm pitch). The tube length is intended to work with lenses from about 135mm to 180mm with a good focusing range, although focusing is slow because the focus thread has just a 3mm pitch.

The Sony E mou