This is a brand new Nikon SLR/DSLR Camera adapter for microscopes. With two adapters included, it offers three mounting sizes on microscope side, 23.2mm, 30mm and 30.5mm, fitting almost all kinds of microscopes including compound and stereo microscopes. Its retail value is $400. Features & Specifications: Compatible with Nikon SLR/DSLR cameras including D40, D40X, D50, D60, D70, D80, D90, D200, D300, D700, D5000, D7000 ... (except G series) Magnification Power: 2X Material: metal Mounting Size on Microscope Side: 23.2mm, 30mm and/or 30.5mm Adapters Included: two adapters converting 23.2mm to 30mm and 30.5mm T-mount Connection Standard 23.2mm Work on Monocular (Eye Tube).