The lens is equipped with the Optical Stabilizer (OS) feature developed by SIGMA, which allows up to 4 levels of shutter speeds, which would otherwise be possible from a free hand. The OS is recommended even if the camera itself should be equipped with a (then switched) image stabilization, since it already stabilizes the viewfinder image and thus facilitates image formation and focusing. Four SLDs (especially low dispersion) glass elements ensure high image quality. The Super Multilayer (SML) coating prevents ghosting and reflections and provides images with a balanced color balance over the entire width of the breach. With a scale of 1: 3.1 at 200mm focal length, the tele is well suited for close-ups. The HSM drive allows the fast and quiet AF, which can be accessed manually at any time. In conjunction with the SIGMA EX converters, a 70-700mm F6.3-8 or a 100-1000mm F9-12.6 MF zoom can be obtained. The included tulip-shaped backlight prevents the incidence of stray incidence effectively. The included adapter ring reduces the 95mm filter thread to 86mm, which allows the use of 86mm filters when used with DSLR cameras with APS-C sensor.