I just picked this up for a couple buck & not sure what I have. I haven't tried it on anything yet but the threads may be 55mm or something near that. It certainly won't screw into any of the D or C mount lenses I have. I have the Vario Switar 12-120 but it's too small for that. Looks brand new to me and kinda neat but it would be nice if I can do something useful with it
The photo (lens and case) 4mm.tiff 246.96KB 14 downloadsis actually off the web but that's the lens. It says Bolex, Aspheron, and 4mm on it.
(if that attachment link doesn't work, i'll try again)
Edited by tom lombard, 16 April 2018 - 03:18 PM.