Carl Zeiss Jena Tessar 50mm f2.8 for M42 projector This Nikon C-PL1L is a

This Nikon C-PL1L is a drop-in circular polarizing filter for select Nikon supertelephoto lenses

Image quality is wonderfully soft wide open

This is purely cosmetic- it's just covering

The size is better suited to a mirrorless or crop-sensor camera

The Quick-Set Hercules is a quick-release mounting system for a big camera

Carl Zeiss Jena Tessar 50mm f2.8 for M42 projector This Nikon C-PL1L is aThis is a classic Zeiss Jena lens, with smooth focusing, good semi automatic diaphragm action, and only light coating marks in the glass. A classic standard lens in polished aluminum, with minor cosmetic wear, but looking pretty nice overall.