An adapter to allow the use of a Wollensak Cine-Velostigmat lens (from an Ellison ½frame 35mm camera c1925) to Leica, L39mm thread. It allows infinity focus, minimum focus is between 2-3ft.
The lens covers full frame 35mm, although the Ellison was a ½ frame camera. Several mounting holes are provided, to allow for different orienteering positions of the lens.
Extra items required: 3 off M2.5 screws (between 5 & 7mm long), 3 off M2.5 half nuts (ie 2mm thick).
(This is an improved design; the adapter should now grip the retaining nuts more securely, making it easier to mount the lens).
This is one of 40 designs for rare or unusual lens adapters, unavailable except as one off or bespoke adapters that I have made, usually in machined in aluminium, over the last 20 years. I've now redesigned them for 3D printing.
Update: about my print made by shapeways; the thread is not as tight as I would like, as the focus on my lens is quite tight so the adapter tends to unthread as I pull to infinity (something like locktite on the thread would fix it, or perhaps the L39 thread on my M43 adapter is slack! - I've not tried it on a Leica camera). Also, by design, the focus goes slightly beyond infinity... if you stack adapters this potentially will get more pronounced. I've used the same dimensions for the L39 thread before and the prints are tighter on my cameras/adapters, so I don't think there is anything I would change at the moment.