Has anyone heard of this company? I have a Coleman-Dynamic Optics 50mm f2.8 lens. Aperture range is 2.8 to 22.
It may perhaps be an enlarging lens. Lens is approximately 2 1/2 inches high, and about the same width. Aperture ring is in front focus ring behind. I have not been able to find anything at all about this lens, I've even contacted a few camera shops who also knew nothing of this lens. I'm at the baffled stage at the moment
Thanks in advance for any guidance