This is a brand new Canon SLR/DSLR Camera adapter for microscopes. With two adapters included, it offers three microscope mounting sizes, 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 Canon SLR/DSLR cameras including 30D, 40D, 50D, 300D, 350D, 400D, 450D, 500D, EOS Rebel XTi, EOS Rebel XS, EOS Rebel XSi, EOS Rebel T1i, T2i ... 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), Binocular (Eye Tube) or Trinocular Photo/Video Port Manufactured under ISO 9001 Quality Control Standard Excellent Five (5) Year Factory Warranty Unbeatable Low Price Guaranteed or the Difference Back! Satisfaction Guaranteed or Your Money Back!