Sigma 20 - 40 / 2,8 EX DG ASP.

The Sigma 1.4x EX DG Tele Converter review is coming ..

One of the best situations in which to consider a third party lens is when the camera body manufacturer does not have an equivalent offering. Meet the Sigma 20mm f/1.8 EX DG Lens - as of this writing, Canon does not offer a lens this wide with an...

One of the best situations in which to consider a third party lens is when the camera body manufacturer does not have an equivalent offering. Meet the Sigma 20mm f/1.8 EX DG Lens - as of this writing, Canon does not offer a lens this wide with an...

This TC makes my sigma 70-200mm f2.8 into a 98-280mm f4 lens. Image quality for all focual lengh and f-stop shows little degradation with the TC. This lens and TC combination basically cover the focal length from 70mm to 280mm without much loss in...

I bought the sigma 1.4x teleconverter for my sigma 100-300 f/4 lens, which becomes 140-420 f/5.6 now, used on Nikon D200, the auto focusing works as fast as the original lens and the image sharpness is only about 5% loss. It's also light weight and...

alaTest has collected and analyzed 32 user reviews of the 20mm F1.8 EX DG ASPHERICAL RF from Amazon.com. The average user rating for this product is 4.0/5, compared to an average user rating of 4.0/5 for other products on Amazon.com.

This is a must have for long fast sigma lenses. it will not work with non sigma lenses

This is a must have for long fast sigma lenses. it will not work with non sigma lenses

I already own and use a heck of a lot Nikon\'s pro 17-35mm D lens, which is only 1.5 stops slower and whose quality is not even bettered by Nikon\'s own 20mm f2.8 D. So, why should I bother with this Sigma? Firstly, the 17-35mm has already been...