The updated 105mm F2.8 EX DG OS HSM Macro lens now features Sigma’s own proprietary Optical Stabilizer (OS) technology, which allows for high-performance, handheld, close-up photography. The telephoto reach makes it a perfect lens for capturing images of insects and small creatures. Additionally, the wide maximum aperture combined with a short telephoto focal length make it very favorable for facial portraiture at lower magnification. A Special Low Dispersion (SLD) lens and one high refractive index SLD lens provide excellent corrections for all types of aberration and distortion.

“This lens is a fantastic addition to our extensive lineup of macro lenses,” said Mark Amir-Hamzeh, president of Sigma Corporation of America. “This is our fourth prime macro lens and the second of which that now includes our Optical Stabilization technology, which steadies the image for handheld use. This is yet another example of Sigma’s dedication to providing an array of unique lens that capture incredible imagery.”

Sigma’s Hyper Sonic Motor (HSM) feature ensures quiet and high-speed autofocus as well as full-time manual focus capability. This lens also has a rounded nine-blade diaphragm that creates an attractive blur to the out-of-focus areas of the image.

The 105mm F2.8 EX DG OS HSM Macro features a floating focusing system that moves two different lens groups in the optical path to different positions. This system compensates for astigmatic aberration and spherical aberration, and provides extremely high optical performance from infinity to 1:1 macro. The super multi-layer coating reduces flare and ghosting, providing high contrast images. It is also possible to use this lens with Sigma’s APO teleconverters.

This announcement comes as part of an ongoing celebration of the company’s 50th anniversary. Find out about special anniversary activities and features, including product videos, photo sharing, photography tips and monthly chances to win Sigma products by visiting the anniversary web page.

For information about Sigma Corporation of America, visit www.sigmaphoto.com. For more information about sigma’s lenses, visit http://www.sigmaphoto.com/shop/lenses.

This ultra-telephoto zoom lens covers a telephoto range up to 500mm and allows photographers to bring the subject close and short perspective. This lens has an equivalent field of view of a 225-750mm when used on digital SLR cameras with an APS-C size image sensor. Sigma’s original OS (Optical Stabilizer) function offers the use of shutter speeds approximately 4 stops slower. As compensation for camera shake is visible in the view finder, the photographer can easily check for accurate focus and ensure there is no subject movement.It is ideal for sports, wildlife and landscape photography with handheld shooting. Three SLD (Special Low Dispersion) glass elements provide excellent correction for chromatic aberration. This lens is equipped with a rear focus system that minimizes fluctuation of aberration caused by focusing. The super multi-layer lens coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF as well as full-time manual focusing capability. The addition of the (optional) 1.4x EX DG APO or 2x EX DG APO Tele Converters produce a 210-700mm F7-9 MF ultra-telephoto zoom lens or a 300-1000mm F10-13 MF ultra-telephoto zoom lens respectively (For Sony fitting only). A removable tripod socket (TS-31) is included as a standard component.

Original of their press release.