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 TypeZoom Lens
Focal Length18-50mm
Mount TypeCanon EF, Nikon F, Pentax K, Sigma SA, Sony Alpha
FormatAPS-C / DX
Compatible Format(s)Nikon DX FX in DX Crop Mode, Canon (APS-C)
Compatible with TeleconvertersNo
Zoom Ratio2.77x
Maximum Reproduction Ratio1:4.1
Optical Stabilization (Image Stabilization)Yes
Aperture Information
Aperture RingNo
Maximum Aperturef/2.8-4.5
Minimum Aperturef/22-36
Maximum Angle of View (APS-C or smaller format)69.3° - 27.9°
Optical Information
Lens Elements16
Lens Groups12
Diaphragm Blades7
Aspherical Elements2 SLD glass elements 3 aspherical elements
Nano CoatingNo
Super Multi-Layer CoatingNo
Focus Information
FocusAutofocus
Built-in Focus MotorYes
Hyper Sonic Motor (HSM)Yes
Internal FocusingYes
Minimum Focus Distance0.30m
Distance InformationYes
Filter Information
Filter Size67mm
Accepts Filter TypeScrew-on
Physical Characteristics
Weather / Dust SealingNo
Mount MaterialMetal
Tripod CollarNo
Dimensions7.39 x 8.86cm
Weight395g
Other Information
Available in ColorsBlack

Lens Construction

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

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