alaTest has collected and analyzed 2 user reviews of Sigma 20-40mm f/2.8 EX DG Aspherical Wide Angle Zoom Lens for Canon SLR Cameras from Amazon.com. The average user rating for this product is 5.0/5, compared to an average user rating of 4.3/5 for other products in the same category on Amazon.com.

This lens is something of an anomaly. Nobody else that I'm aware of makes a lens that covers this particular range. The closest thing I can think of is the Olympus 11-22mm (which with their 2x crop becomes a 22-44mm). This range of focal lengths is...

I like this lens, its a very good alternative to my brilliant Tamron 17-50 2.8 (which I use with the Canon 20 DA). The price was really nice specially offering a beautiful design and construccion. I use this lens at my Pentax K 10 and its a really...

Having owned this lens for a year now and having read all the reviews posted on other sites I feel this lens has been overlooked somewhat due to it not being designed for an aps-c sized sensor.

I bought this lens after selling my nikkor 18-70 kitlens and I did not regret it. It produces clear and sharp images, vivid colors. Little barrel distortion at 20 mm which can be corrected in PS easily. The only problem is chromatic aberration,...

Sigma has produced an excellent 2x wide angle zoom lens with the 20-40 f2.8 EX DG.