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Sigma 18-50mm F2.8 EX DC for Four Thirds

Sigma 18-50mm F2.8 EX DC LensPMA 2006: The Sigma 18-50mm F2.8 EX DC lens for Four Thirds is announced at PMA today.

Sigma UK Press Release

EX series, large aperture zoom lens designed specifically for use with digital SLR cameras is now available in the Four Thirds fitting.

The Sigma Corporation is pleased to announce the new 18-50mm 2.8 EX DC for the Four Thirds fitting. 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 colour balance whilst cutting down flare and ghosting, caused by reflections from the digital image sensor and lens. It has excellent correction for vignetting and superior peripheral brightness is ensured.

- EX lens series denotes excellence of engineering and new technology.
- Compact and lightweight zoom design 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

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.), 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 an inner focusing system. The non-rotating front lens element makes the lens suitable for using its petal-type lens hood and circular polarizing filters. 

THE SPECIFICATIONS
Focal Length (4/3 Format) 36-100mm
Minimum Aperture F22
Lens Construction 15 Elements in 13 Groups
Angle of View (4/3 Format) 59°- 24°
Number of Diaphragm Blades 7pcs
Minimum Focusing Distance 28cm (11”)
Maximum Magnification 1:5
Filter Size 67mm
Lens Hood Petal-type hood
Dimensions Diameter 74.1mm (2.9”)X Length 84.1mm (3.3”)
Weight 445gr/15.6ounces
SRP                 £369.99

The appearance and specifications of the product are subject to change for improvement without notice.

* Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.

Published: Sunday, February 26, 2006

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