High-speed zoom lens provides fast f2.8 maximum aperture at all zoom settings for the highest shutter speed possible. If you're looking for a high performance tele zoom for sports, action, nature, portraiture and other types of photography, here's an excellent choice that will cost you hundreds of dollars less than a comparable lens from your camera maker. Since it is a Tamron Di-series lens, it is fully compatible with digital SLRs that have either full size or APS-C size sensors, as well as 35mm SLRs. Internal focusing system allows easy filter control, while focusing quickly from infinity to a close 3.2 ft., better than most other lenses in this class. Low Dispersion elements control chromatic aberration for outstanding image quality. Measures 7.6" long, weighs 2.5 lbs., accepts 77mm filters, aperture range f2.8-f32, focuses as close as 3.2 ft., includes hood, removable tripod mount, and case.