Sigma 18-50mm f/2.8-4.5 DC OS HSM

Lens Summary

Brand: Sigma

Also Known As: Sigma 18-50mm f/2.8-4.5

Lens Type: Zoom Lens

Format: APS-C / DX

Focus: Autofocus

Lens Mount: Canon EF, Nikon F, Pentax K, Sigma SA, Sony Alpha

Release Date: 2009-03-03

MSRP Price: $179

Made in: Japan

Infrared Rating: Poor

Production Status: Discontinued

Lens Description: An upgrade to its predecessor, the 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. 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 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. 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. 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 ratio of 1:4.1. The incorporation of HSM (Hyper Sonic Motor) ensures a quiet and high speed auto focus.

Sigma 18-50mm f/2.8-4.5 DC OS HSM Specifications

Lens Specifications
Lens Type Zoom Lens
Focal Length 18-50mm
Mount Type Canon EF, Nikon F, Pentax K, Sigma SA, Sony Alpha
Format APS-C / DX
Compatible Format(s) Nikon DX FX in DX Crop Mode, Canon (APS-C)
Compatible with Teleconverters No
Zoom Ratio 2.77x
Maximum Reproduction Ratio 1:4.1
Optical Stabilization (Image Stabilization) Yes
Aperture Information
Aperture Ring No
Maximim Aperture f/2.8-4.5
Minimum Aperture f/22-36
Maximum Angle of View (APS-C or smaller format) 69.3° - 27.9°
Optical Information
Lens Elements 16
Lens Groups 12
Diaphragm Blades 7
Aspherical Elements 2 SLD glass elements 3 aspherical elements
Nano Coating No
Super Multi-Layer Coating No
Focus Information
Focus Autofocus
Built-in Focus Motor Yes
Hyper Sonic Motor (HSM) Yes
Internal Focusing Yes
Minimum Focus Distance 0.30m
Distance Information Yes
Filter Information
Filter Size 67mm
Accepts Filter Type Screw-on
Physical Characteristics
Weather / Dust Sealing No
Mount Material Metal
Tripod Collar No
Dimensions 7.39 x 8.86cm
Weight 395g
Other Information
Available in Colors Black

Lens Construction

Sigma 18-50mm f/2.8-4.5 DC OS HSM diagram

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