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The following is an unedited press release, shown as received from the company represented. We've elected to present selected releases without editorial comment, as a way to provide our readers more information without further overtaxing our limited editorial resources. To avoid any possible confusion or conflict of interest, the Imaging Resource will always clearly distinguish between company-provided press releases and our own editorial views and content.

Sigma's 18 - 50mm F2.8 EX DC lens. Courtesy of Sigma, with modifications by Michael R. Tomkins. PRESS RELEASE: Sigma New Product Information: 18 - 50mm F2.8 EX DC

EX series, large aperture zoom lens designed specifically for use with digital SLR cameras.

  • EX lens series denotes excellence of engineering and new technology.
  • Compact and lightweight zoom despite large F2.8 aperture.
  • Excellent correction for various types of aberration provided by one SLD (Special Low Dispersion) glass element and two aspherical lenses.
  • Super Multi Layer (SML) coating reduces flare and ghosting from which digital cameras tend to suffer.
F2.8 large aperture standard zoom lens designed specially for use with digital SLR cameras.

The characteristics of digital SLR cameras were taken into consideration when designing the lens power layout. The new advanced lens design corrects various aberrations. This lens provides the utmost correction against lateral chromatic aberration which is a serious problem for digital SLR cameras.

This lens is specially coated to get the best color balance whilst cutting down flare and ghost caused by reflections from the digital image sensor and lens. It has excellent correction for vignetting and superior peripheral brightness is ensured.

A Special Low Dispersion (SLD) lens and two aspherical lens elements provide excellent correction for all types of aberrations. The design produces a compact and lightweight, yet robust, construction with an overall length of 84.1mm (3.3in.) and maximum diameter of 74.1mm (2.9in.) and weight of 445g (15.6oz).

This lens has a minimum focusing distance of 28cm (11in.). It is equipped with inner focusing system. The non-rotating front lens element makes the lens suitable for using its petal-type lens hood and circular polarizing filters.

It is an ideal large aperture standard zoom lens for digital SLR cameras featuring APS-C size image sensor.


Sigma's 18 - 50mm F2.8 EX DC lens. Courtesy of Sigma, with modifications by Michael R. Tomkins.
Focal Length18-50mm
Minimum ApertureF22
Lens Construction15 Elements in 13 Groups
Angle of View69.3°- 27.9°
Number of Diaphragm Blades7pcs
Minimum Focusing Distance28cm (11in.)
Maximum Magnification1:5
Filter Size67mm
Lens HoodPetal-type hood
DimensionsDiameter 74.1mm (2.9 in.)X Length 84.1mm (3.3in.)
  • The appearance, specifications, and the like of the product are subject to change for improvement without notice

(First posted on Monday, July 19, 2004 at 21:26 EDT)

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