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11-08-2010, 03:45 AM   #1
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pentax 12-24mm wide angle or sigma 10-20mm? Quality issues

How do these two compare against each other. I am a noob in the field of photography and am currently searching for wide angle lens. Any quality issues with the sigma wide angle lens?

11-08-2010, 08:15 AM   #2
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Hello,

The Sigma 10-20mm f/4-5.6 EX DC lens offers an ultra-wide zoom solution to digital cameras, and was exclusively designed to suit the characteristics of digital SLR cameras.

Lens Construction 14 Elements in 10 Groups

Three aspherical lens elements offer excellent correction for distortion and Three SLD (Special Low Dispersion) glass elements employed for effective compensation of color aberration.

Sigma 10-20mm f/4-5.6 EX DC Autofocus Lens for Pentax 201109 B&H



The Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom is a super-wide angle lens with a relatively bright f/3.5 maximum aperture throughout its zoom range, helping to ensure high image quality. The lens gathers enough light to make it a great choice for indoor shooting as well as landscapes and creative portraiture.

Lens Construction 13 Elements in 10 Groups

Two ELD (Extraordinary Low Dispersion) glass elements and a SLD (Special Low Dispersion) glass element provide excellent color fidelity, and 4 aspherical lens elements provide correction for common distortions.

Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens 202109 B&H

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.


The Sigma Zoom Super Wide Angle 12-24mm f/4.5-5.6 EX Aspherical DG Autofocus Lens for Pentax AF is designed for use with full frame digital cameras. May also be used with smaller APS-c size sensors with a corresponding effective increase in focal length to about 17-35mm with most cameras.

Three Aspherical glass elements offer correction for distortion and four SLD (Special Low Dispersion) glass elements employed for effective compensation of color aberration.

Sigma 12-24mm f/4.5-5.6 AF Lens 200109 B&H Photo Video


All of the lens are excellent. I'd had a Sigma 28mm f1.8 lens for years and have had no issues with it.


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11-08-2010, 09:26 AM   #3
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A retailer is not going to tell you about quality issues with products they sell as it opens up a can of worms :-)

However, there are several threads comparing the lenses, and each has a specific thread for images.
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