The Navitar DO-5095 is a 50mm 1 megapixel lens with a M62x0.75 filter size, and 110 resolution.
The Navitar High Speed 1" Lens for Low-Light Imaging family features C-mount, 1" format lenses, 17, 25 and 50 mm focal lengths, for low light applications, ideal for chemiluminescence, digital x-ray, motion analysis, gel documentation, crystallography, fluorescence imaging, holographic imaging, screw locks.