Sigma 28-70 mm f2.8 EX Aspherical DF combines a fast, constant f2.8 maximum aperture with a popular range of focal lengths from 28 mm wide-angle to 70 mm medium range telephoto with an upgraded design. It is the world's smallest 28-70 mm f2.8 zoom lens. The lens also incorporates a dual focus mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focusing and yet provides adequate focusing torque of the focusing ring during manual focusing of the lens. Helical focus system of the lens eliminates front lens rotation, thus allowing the use of a Perfect Hood and easy to use polarizing filters. It incorporates 2 aspherical lenses in the front and rear lens groups, provides high performance and superior optical quality. Minimum focusing distance is 40 cm/15.7 inches at all focal lengths. Sigma 28-70 mm f2.8 EX Aspherical DF is equipped with a Perfect Hood to prevent extraneous harmful light for image quality. The lens materials used in this new lens are lead and arsenic free ecological glass.
Fast, constant maximum aperture of F2.8 and covers the popular focal length range of 28mm wide angle to 70mm mid-range telephoto
Two aspherical elements help maintain its high optical performance throughout its zoom and focus ranges.
World's smallest zoom lens in this category, just 3.9" in length.
A minimum focusing distance of just 15.7 inches, at all focal lengths, also gives it the world"s shortest close focusing capability.
Equipped with a perfect hood and incorporates helical focusing to eliminate front lens barrel rotation during focusing, for added convenience when using polarizing filters.
Sigma's ZEN finish prevents reflections, resists scratches and provides a secure, non-slip grip.