Sigma 18-50mm f/2.8 EX DC Macro Lens for Pentax Digital SLR

BH #SI185028MPAF • MFR #581109
Sigma
Sigma 18-50mm f/2.8 EX DC Macro Lens for Pentax Digital SLR
Key Features
  • Zoom Super Wide Angle
The popular Sigma 18-50mm f/2.8 EX DC Macro Lens has been improved with closer focusing capabilities - as close as 7.9" (20cm) - and has a maximum magnification rating of 1:3, ideal for close-up photography. The characteristics of digital SLR cameras were taken into consideration when designing the lens power layout. The 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 also specially coated to get the best color balance with a digital camera, while also cutting down flare and ghost caused by reflections from the digital image sensor and lens. It has correction for vignetting, and superior peripheral brightness is ensured. Ideal as a standard quality zoom lens with added macro capability, this lens provides an equivalent range of approx. 27-75mm when used with a Pentax digital SLR camera (*).

DC lenses are exclusively designed for digital SLR cameras. The image circle (rear of lens) is made to match the smaller dimensions used for the image sensor on digital cameras. As a result, these lenses are also more compact and lightweight, and are better matched to digital SLR cameras.

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Sigma 581109 Overview

The popular Sigma 18-50mm f/2.8 EX DC Macro Lens has been improved with closer focusing capabilities - as close as 7.9" (20cm) - and has a maximum magnification rating of 1:3, ideal for close-up photography. The characteristics of digital SLR cameras were taken into consideration when designing the lens power layout. The 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 also specially coated to get the best color balance with a digital camera, while also cutting down flare and ghost caused by reflections from the digital image sensor and lens. It has correction for vignetting, and superior peripheral brightness is ensured. Ideal as a standard quality zoom lens with added macro capability, this lens provides an equivalent range of approx. 27-75mm when used with a Pentax digital SLR camera (*).

DC lenses are exclusively designed for digital SLR cameras. The image circle (rear of lens) is made to match the smaller dimensions used for the image sensor on digital cameras. As a result, these lenses are also more compact and lightweight, and are better matched to digital SLR cameras.

Note:
(*) Not compatible with 35mm cameras or digital cameras using full-size image sensors.
EX lens series denotes excellence of engineering and new technology
Large aperture of f/2.8 throughout the entire zoom range
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

Sigma 581109 Specs

Filter Size72mm
f/Stop Range2.8-22
Minimum Focus Distance7.9" (20cm)
Magnification1:3
Zoom/Focus ControlTwo touch
Angle of View69.3-27.9°
Groups/Elements13/15
Length3.4" (86mm)
Maximum Diameter3.1" (79mm)
Weight15.9 oz (450g)
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