Excerpt: I will be returning this lens. I bought it for bird photography. It is a very very heavy 4.5 lbs. It is very bulky. Even though they claim it can be hand held with great results because of its in lens optical stabilization I found that didn't work at all. You must have a tripod or forget it.
Pros: Manual Focus, Strong Construction
Cons: Blurry Focus, Heavy, Poor in Low Light, Slow Focus, Tough To Attach
Summary: -This lens is unacceptable. Sigma should remove this line from production until they get this lens to work properly. -Sigma makes zoom lenses with interesting range, the range we dream about such as 18-250. 50-500. I bought the 18-250 in the past and it was satisfactory.
Summary: der mir und meinem Geldbeutel weh tut. Die Tele Aufnahmen mit Telekonverter 2XEX APO DG sind schwierig scharf zu kriegen. Ohne Stativ geht da wohl gar nichts. Deshalb nehme ich es auch selten für Tele Aufnahmen. Für Tele ein Tele .....