GOI Helios-54 2/135mm Prototype #5326 f. M42 Mount

This lens is a 135mm f/2 in black paint finish. The drawing and testing is from 1952. It covers 6x6cm but was designed for 18x24 cinema use.

The optic has a very tiny scratch on the front element and glass bubbles inside, the previous owner made a focusing mount with M42 lens mount so you can use it on many different cameras.

The lenses are otherwise very clean and the aperture works well.