Here we have a well used Canon EF-S 17-55mm F2.8 IS lens. This is for Canon crop sensors only, it will not work on full frame cameras. The lens is well used and has some damage. It was dropped and luckily the filter took the brunt of it. The filter ring has 2 cracks in it. When I went to the local camera shop to have the filter removed they told me I couldn't put another filter on, or if I did it wouldn't come off again. The lens is also not clean and has significant dust underneath. However photo quality is not affected, I posted photos taken with the lens to show that. The IS works flawlessly. The back of the lens is clean. It works fine, it just isn't pretty. Here are some specs:     Focal length: 17-55mm     Maximum aperture: f/2.8     Lens construction: 19 elements in 12 groups     Diagonal angle of view: 78 degrees (at 30 feet) to 27 degrees (at 50 feet)     Focus adjustment: AF with full-time manual     Closest focusing distance: 1.15 feet (Approximately 13.8")     Zoom system: 5-group helical zoom (front group moves 27mm)     Filter size: 77mm     Dimensions: 3.3 inches in diameter, 4.4 inches long     Weight: 22.8 ounces