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 |
| 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 |
| Dimensions | 7.39 x 8.86cm |
| Weight | 395g |
| Other Information | |
| Available in Colors | Black |
Lens Construction
