Setting high performance DSLRs free with SP engineering, strengthened by F/2.8 maximum aperture advantages.
One of two Tamron 17-50mm F/2.8 offerings, the image integrity and compositional options afforded by the SP 17-50mm F/2.8 Di-II’s wide to moderate telephoto zoom characteristics are prized by experienced photographers. Both versions of the SP 17-50mm F/2.8 stem from the long-successful SP 28-75mm F/2.8 originally designed for 35mm film SLRs. Later refined to meet the needs of high resolution digital SLRs with APS-C-format sensors, and like its further refined variant the 17-50mm renders a picture angle range approximating a 26-78mm lens on a full frame DSLR or a 35mm SLR. A fast and constant F/2.8 maximum aperture benefits photographers in several ways, including the ability to render cluttered backgrounds well out of focus, expanded low light shooting freedom and a brighter viewfinder image. With its mildly less complex optical formula and without tri axial VC Vibration Compensation the SP 17-50mm F/2.8 Di-II  stands out as a remarkable value and a favorite of passionate photographers.