I purchased this for photography and opened it once, but never used it. I stored it in a cabinet with a door, so I believe the condition is equivalent to new. ● This is an adapter for connecting various microscopes and single-lens reflex cameras. You can utilize your digital SLR camera to build a low-cost, high-performance digital image system for microscopes. ● The included adapters can connect to C-mounts of all microscope manufacturers, as well as old Olympus microscopes (BH/BH2 microscopes, etc.), old Nikon microscopes (Optiphot), JIS eyepieces (inner diameter 23.2mmφ), and the eyepiece of stereo microscopes (inner diameter 30mmφ). ※ Items in red are standard components. ● High-precision optical lenses allow for clear photography throughout the entire field of view. By using a CCD camera adapter, you can connect a C-mount compatible microscope camera to a microscope. Includes a focus adjustment mechanism. Compatible with eyepiece micrometers (19mmφ).