The Canon EF-mount 150-600mm f/5-6.3 DG OS HSM from Sigma is a Contemporary-series telephoto zoom characterized by its sophisticated optics and flexible handling. One FLD element and three SLD elements are used to reduce color fringing and chromatic aberrations throughout the zoom range and a Super Multi-Coating also helps to suppress flare and ghosting for improved contrast and color accuracy when working in strong lighting conditions. An Optical Stabilizer also works to minimize the appearance of camera shake for sharper handheld shooting. Additionally, a removable, rotating tripod collar is included to suit working atop a tripod or monopod. Telephoto zoom is designed for full-frame Canon EF-mount cameras, however can also be used with APS-C models where it provides a 240-960mm equivalent focal length range. A Super Multi-Layer Coating has been applied to lens elements in order to minimize lens flare and ghosting and contribute to producing contrast-rich and color-neutral imagery, even in backlit conditions. The optical Stabilizer system minimizes the appearance of camera shake to benefit making sharper imagery when shooting handheld. Dust- and splash-resistant design suits this lens's use in inclement weather conditions and a water- and oil-repellent coating has also been applied to the front element to aid in cleaning. The zoom lock switch can be activated at any focal length to prevent accidental and unwanted zoom adjustment. A removable, rotating tripod collar offers well-balanced support for photographing atop a tripod or monopod with either vertical or horizontal shooting orientations.