Compactness, light weight and affordability are brought together in the Tamron 70-300mm F/4-5.6 Di, giving emerging photographers an alternative to the highly lauded SP 70-300mm F/4-5.6 Di VC USD. Picture takers eager to bring distant sports or wildlife subjects closer, as well as bringing tiny, close range subjects into clear focus will appreciate the standout macro function, available at focal lengths between 180 and 300mm. Capable of a maximum magnification ratio of 1:2 (one half life-size) close-up detail fills the viewfinder. Also, because the macro function is available at the lens' longer telephoto settings, an extended subject-to-lens working distance is maintained.
Designed for optimum handling ease and portability (it weighs only 458g <16.2oz.> ), it’s ideal for handheld shooting with full-frame and APS-C format SLRs. Its unsurpassed close-focusing ability (down to 0.95m (3.1 feet ) or 1:2 in macro mode) makes it perfect for nature and portrait photography.
Low dispersion (LD) glass elements in a lens help reduce chromatic aberration; the tendency of light of different colors to come to different points of focus at the image plane. Chromatic aberration reduces the sharpness of an image, but glass with an extremely low dispersion index, has less of a tendency to separate (defract) a ray of light into a rainbow of colors. This characteristic allows the lens designer to effectively compensate for chromatic aberration at the center of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (towards the edges of the field) that often occurs at short focal lengths (the wide-angle end of the zoom range.)"
