Previously I had the Sigma 10-20mm F3.5 EX DC only to a EOS 50D and later to a 5DMKII and EOS6d in use. Unfortunately, the Sigma did not support the full frame. So I was looking for a lens that I can also use the EOS6D. After much research (Traumflieger etc.), the choice fell on this ingenious lens. Granted, some would buy 2 Cheap other SLR for that price - but the photo application you can see the striking difference: sharpness and light sensitivity to the Sigma are not comparable. From the weight, it is acceptable. Buying tip!
