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The Tamron 70-180mm f/2.8 Di III VXD is a unique take on the ubiquitous and popular telephoto zoom. Designed for full-frame Sony E-mount cameras, this lens spans a useful short-telephoto to mid-telephoto range and is characterized by its f/2.8 maximum aperture to suit working in available light conditions and for controlling depth of field. Additionally, a floating elements system is used to ensure consistent image quality throughout the focusing range, from 2.8' to infinity. Suiting this lens's use in inclement weather conditions, it also features a moisture-resistant construction along with a fluorine-coated front element to protect against fingerprints and smudging.Bright constant f/2.8 maximum aperture affords consistent brightness throughout the zoom range and offers improved control over depth of field.Three aspherical elements, including both glass-molded and hybrid types, help to reduce spherical aberrations and distortion for high sharpness and accurate rendering throughout the zoom range.Two VXD (Voice-coil eXtreme-torque Drive) linear motors deliver impressively quiet, quick, and precise focusing performance to suit both stills and video applications. This focusing system offers a minimum focusing distance of 2.8' at all focal lengths, and a 1:4.6 maximum magnification at the 180mm focal length for working with close-up subjects. Full-time manual focus override is also possible, and it is compatible with Sony's Direct Manual Focus function or fine-tuned manual control.When working with manual focus at the 70mm focal length position, it is possible to focus as closely as 10.6" with a 1:2 maximum magnification ratio, however peripheral image quality may be reduced.