3 out of 10 points and not recommendedNoneFocus
I order the USA version of this lens from Sigma4Less but I got the imported version.reviewed June 1st, 2008 (purchased for $430)
This copy has serious focus problems at 17mm and back focus at 50mm. At 17mm never got focus at any distance, at 50mm has terrible back focus.
The lens was unacceptable at any focal range. I do not think is a camera (D300) problem because I have 7 more lenses that work perfect.
Sigma4Less accept that it was his error but they refused to exchange because I opened and used the lens. They offered me a MACK warranty so …
I will you posted about what MACK guys did.
9 out of 10 points and recommendedIncredible range, sharp, OSNONE
50-500mm wow!reviewed January 31st, 2011 (purchased for $1,800)
This lens is very sharp almost to 400mm and sharp at 500mm. Also the edges at 500 are not perfect, but not bad.
The focal range from 50 to 500mm is great!
The OS work really great. I found mode II work very good on a monopod.
The AF didn´t work at all with the 1.4x sigma extender.
The AF is very very fast and accurate.