Ronkonkoma, NY—Sigma Corporation released its new 17-50mm f/2.8 EX DC OS HSM lens—a large-aperture standard-zoom lens that was first introduced at PMA 2010 and is designed for small chip APS-C digital cameras. The lens incorporates Sigma’s optical stabilization (OS) functionality and new FLD glass.
The ultra-compact lens has an overall length of 3.6 inches and provides a focal length from a 17mm wide angle, a minimum focusing distance of 11 inches throughout the entire zoom range, and a maximum magnification ratio of 1:5.
Its OS function offers the use of shutter speeds approximately four stops slower than would otherwise be possible, and with it, Sigma has made it possible for Pentax and Sony shooters to utilize an anti-shake system in either the lens or the camera body. The compensation for camera shake is visible in the viewfinder for all mounts.
“This lens is a must-have for any photo opportunity,” said Mark Amir-Hamzeh, general manager, Sigma Corporation of America. “The fast aperture allows for shooting in low, existing light or at maximum range with a flash. This is an ideal, all-purpose lens for everyday shooting.”
Sigma also notes that its FLD glass has an “extremely high light transmission and anomalous dispersion, making it the top level of low dispersion glass available.” With a performance equal to fluorite glass, this optical glass has a low refractive index and low dispersion compared to current optical glass, for correction of residual chromatic aberration (secondary spectrum), which cannot be corrected by ordinary optical glass. In addition, the new lens employs a hybrid aspherical lens and two glass-mold elements for correction of distortion and astigmatism.
Other features include: a super-multilayer coating to reduce flare and ghosting; a Hyper Sonic Motor (HSM) to help provide quiet high-speed autofocus, as well as full-time manual focus capability; a rounded, seven-blade diaphragm to create an attractive blur to out-of-focus areas; and an inner focusing system to eliminate front lens rotation and make the lens suitable for use with the supplied petal-type lens hood and circular polarizing filters.
Sigma’s 17-50mm f/2.8 EX DC OS HSM lens is currently available in Canon mounts for an MSRP of $980, and it will be available in Nikon, Sigma, Sony and Pentax mounts in the coming weeks. sigmaphoto.com