Ideal for travel and snapshot photography, this lens uses Sigma's own triple-cam internal focus system and achieves high performance in a compact package. This high magnification zoom lens covers focal lengths from 28mm wide angle to 200mm telephoto, with closeup capability. With 2 aspherical lenses, it has excellent correction for all types of aberration. It incorporates special internal focusing to enable it to focus as close as 48cm (18.9 inches) from film plane to subject, at all focal lengths, and to the use of polarizing filters. A detachable "perfect hood" is provided. The optical materials used in this new lens are lead and arsenic free ecological glass.
The aspherical lens contributes more than compact size: it also delivers improved image quality. The front lens group has excellent correction for distortion at the wide-angle setting, and the rear lens group effectively corrects for spherical aberration, coma aberration, and astigmatic aberration throughout the entire zoom range. This adds up to a lens with outstanding optical ability.
Because of the inner focus system, the front barrel does not have to rotate to focus the lens, and a circular polarizing filter can be easily used. In addition, a Petal-type hood can be mounted on the lens to give optimum protection from flare.
Lens Construction - 16 Elements in 14 Groups
Angle of View - 75.4 - 12.3 degrees
Number of Diaphragm Blades - 8 Blades
Minimum Aperture - F22
Minimum Focusing Distance - 48cm
Maximum Magnification - 1:3.8
Filter Size - 62mm
Dimensions - Diameter 70mm X Length 77.7mm
Weight - 400g