Tamron AF 70-210mm F2.8 SP LD /Sony A-mount lens 77mm filter. Constant f2.8 through the entire zoom range Fits all Sony a-mount cameras Full Frame and APS-C, plus Minolta AF cameras. 70mm - 210mm is equivalent to 107mm - 321mm with APS-C cameras. (Link to list of cameras below). This is a Fantastic lens, high build quality and it shows with the superb quality pictures. Built like a tank for a lifetime of use. I paid $650 for this lens three years ago, don't really want to sell it but I have more lenses than I can use. *A list of Sony cameras that fit this lens. https://en.wikipedia.org/wiki/List_of_Sony_A-mount_cameras *Specs: -Look at the chart on each of the two links below for all specifications on this lens. http://www.dyxum.com/lenses/Tamron-AF-70-210mm-F2.8-SP-LD_lens189.html http://allphotolenses.com/lenses/item/c_3431.html