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The Sigma 18-50mm f/2.8-4.5 DC OS HSM is a lens dedicated to digital SLR cameras with APS-C size image sensors offering a large aperture and Sigma's Optical Stabilization and provides a high level of optical performance. The combination of the large aperture of f/2.8 and anti-shake function makes capturing exceptional photos in low light achievable, and the wide angle is well suited for indoor photography. It offers superior peripheral brightness as well as a compact and lightweight construction. Two SLD (Special Low Dispersion) glass elements and three Aspherical lenses provide excellent correction for all types of aberrations. The Super Multi-Layer Coating reduces flare and ghosting. Designed with inner focusing and inner zooming systems, high image quality is assured throughout the entire zoom range. This lens has a minimum focusing distance of 11.8 inches (30cm) throughout the entire zoom range and a maximum magnification ratio of 1:4.1.
Note! Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras. For Pentax mount, if the camera body does not support HSM, auto focus will not be available.
Optical Image Stabilization
Sigma's anti-shake function makes capturing exceptional photos in under most lighting situations achievable.
HSM Autofocusing for Pentax D-SLR Cameras
Inner Focus System
An inner focusing system eliminates front lens rotation, making the lens particularly suitable for using the petal-type lens hood (supplied) plus circular polarizing filters.
Excellent optical design
Special Low Dispersion (SLD) and Extraordinary Low Dispersion (ELD) glass elements provide excellent correction of color aberrations. This lens produces an exceptional level of optical performance.
Reduced Ghosting and Flare
The super multi-layer lens coating reduces flare and ghost. High image quality is assured throughout the entire zoom range.
Ideal For Portraits and Snaps
With a minimum focusing distance of 7.9", and a maximum magnification of 1:3, this large aperture standard zoom lens, with close-up ability, is ideal for portrait and snap shots.
Compact and Lightweight Lens
Its design incorporates both glass-mold and hybrid aspherical lens technology which offers a compact and lightweight construction.
• Sigma 18-50mm f/2.8-4.5 DC OS HSM Zoom For Pentax D-SLRs
• Petal-Type Lens Hood