Large Aperture, Standard Zoom with Optical Stabilization.

An upgrade to its predecessor, the 18-50mm F2.8-4.5 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.

Once again, Sigma has also engineered the built-in OS function, an anti-shake system, (for Sony and Pentax mount) allowing the photographer to see a stabilized image in the viewfinder. The combination of the large aperture of F2.8 and anti-shake function makes capturing exceptional photos in low light achievable, and the wide angle is wellsuited for indoor photography.

Two SLD (Special Low Dispersion) glass elements and three Aspherical lenses provide excellent correction for all types of aberrations. The Super Multi-LayerCoating reduces flare and ghosting. Designed with inner focusing and inner zooming systems, high image quality is assured throughout the entire zoom range.

The overall length of the lens does not change during focusing and zooming ensuring convenient handling. This lens has a minimum focusing distance of 11.8 inches (30cm) throughout the entire zoom range and a maximum magnification ratioof 1:4.1. The incorporation of HSM (Hyper Sonic Motor) ensures a quiet and high speed auto focus.

Features

• Optical Stabilizer: Sigma's own OS System
• Large Aperture/Wide Angle: Superior low light photos
• High Image Quality: Two SLD glass elements and three Aspherical lenses corrects all aberrations
• Includes: Petal-Type Hood

Specifications

Construction	16 Elements in 12 Groups
Angle of view	69.3 - 27.9 degrees
F stop range	f/22
Closest Focusing Distance	30 cm / 11.8 inches
Maximum Magnification	1:4.1
Filter Size	67mm
Dimensions (Length x Diameter)	Diameter 74mm X Length 88.6mm
Weight	395g / 13.9 oz
Notes	Number of Diaphragm Blades: 7 Pcs. * 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.

Includes

• Petal-Type Hood
• Front & Rear Lens Caps