The brand-new Tamron 17-35 F/2.8-4 Di OSD Lens is a versatile wide-angle lens for 35mm full-frame DSLR cameras that is the smallest and most lightweight in its class. Don't let the small size fool you; this lens packs quite a punch! With a focal length that ranges from an ultra-wide 17mm to an industry standard 35mm, this lens is perfect for any shot. A moisture resistant construction along with fluorine coating means this lens is as tough as you and can withstand whatever elements life throws at it. It can connect to the Tamron Tap-In Console, which connects your lens via USB to your PC so you can stay up to date in firmware improvements or to customize your AF settings.Superior Optical PerformanceThis Tamron 17-35mm lens has an impressive construction with 15 lens elements in 10 groups, including 4 LD (low dispersion) lens elements and 2 GM (glass molded) aspherical lens elements to minimize axial chromatic aberrations and control distortion and spherical aberrations. This Tamron lens has a large f/2.8 aperture at the wide-angle end while sporting a sharp f/4 aperture at the telephoto end. It was specially designed to increase sharpness and contrast.Optimized Silent DriveThe 17-35mm f/2.8-4 lens has a built-in OSD (optimized silent drive) for incredible autofocus performance. The optimized nature of the AF allows for reduced noise reduction, giving you a smoother and nearly silent operation. Despite its quiet nature, the OSD provides a lightning fast autofocus every single time.Solid BuildThe Tamron 17-35mm F/2.8-4 Di OSD lens was built as the most compact and lightweight lens in its class. It features a 7 bladed diaphragm to retain a smooth aperture opening. A Moisture Resistant barrel with several seals along the lens construction combines with a fluorine coating to give you maximum operability in even the harshest weather conditions.
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