This lens can be used as a spotting scope or as a telephoto lens on a DSLR camera. A T-Ring adapter is included for a Nikon Camera (F mount). Additional adapters are available for other brands of cameras and sell for about $10. Magnification at 800mm is 16X compared to 50mm lens. Also included are a 30mm eyepiece for 25X and a 18mm eyepiece for 42X. Also the original box and Instruction Manual. Price is: $100 plus $10 shipping within the conus. Paypal or money order is the fastest.