This rare near-mint condition Bell & Howell Taylor Hobson 1.5'' (38mm) f/1.9 Super Comat cine lens is NOT D or C mount. It has a 18mm screw mount for use on 134 V, 134-W, 172-A, 172-B, and 172-C cameras. The only thing holing it back from being mint is a very light haze inside of it. Its focus and aperture adjustments are both smooth.