The Sigma APO 120-300mm f2.8 EX DG HSM Lens for Nikon Digital SLR Cameras features a large aperture of f2.8 at the 300 millimeter focal length and is optimized for used with digital SLR cameras. This lens transforms a large-aperture f2.8 300 millimeter lens into a zoom lens that allows you to determine the picture composition you want without having to change your vantage point. It has two SLD (Special Low Dispersion) glass elements in front group and another SLD element in the rear group for excellent correction of chromatic aberration.
The latest in multi-layer lens coating technology and lens design reduce flare and ghosting, which is a common problem with digital cameras, and it also creates an optimum color balance through the entire zoom range. The lens' AF drive is equipped with a silent, responsive and high speed Hyper Sonic Motor (HSM), which also provides full-time manual focus function. Since focusing and zooming do not change its overall length, this lens is easy to hold and use. In addition, since the front of the lens does not rotate, a circular polarizing filter can be easily attached and used. High-speed focusing is possible when this lens is used with dedicated APO EX 1.4 x or 2x tele-converters (sold separately).
A telephoto zoom lens, which retains a constant fast aperture of F2.8 at all focal lengths. This telephoto zoom lens has a large aperture of F2.8 that is constant throughout the zoom range. The angle of view of the 120-300mmF2.8 varies from 20.4degree to 8.2degree and offers great versatility of composition from a fixed position. Two Special Low Dispersion (SLD) glass elements in the front lens group and two in the rear group offer effective compensation of color aberration. Since focusing and zooming do not change its overall length, this lens offers ease of handling. HSM ensures a quiet, high-speed, AF as well as full-time manual focus (for Sigma, Canon and Nikon mounts).