This is a Lens Ring Adapter, Working diameter 40mm 50mm,,Applicable to 120X 180X 300X working diameter 50mm Monocular c-mount lens.

 

 

Model: Video C Mount Microscope Camera Monocular Lens Ring Adapter

Inside Diameter: 50 mm 42mm

Outside Diameter: 50mm 58mm

Working Diameter: 50mm 40mm

Material: Metal

 

Package Including:

1 x 40mm 50mm Ring Adapter