Then I tried the lens on both the new Nikon D7100 and the Nikon D90 in different situations both indoors and out, tested different aperture settings, ordinary indoor shots with or without flash, unfortunately, were about 100 shots, only 2 really really hot ,
I take pictures with the Nikon 50mm 1.4 lens and the Nikon 85mm 1.8 lens and therefore know very well what it's like to shoot with open aperture. The Sigma, because if it had delivered sharp photos, a good complement to the other two fixed focal length would have been.
With the same motif with the same open aperture and a direct comparison between the Nikon 50mm and the Sigma 30mm pictures with the Sigma were just blurred, and not just on the edge, but in part also in the middle. While the images seemed to be acceptable in the small display of the two cameras, they were on the monitor after transfer deficient high just in focus range.
For the available-light photography when shooting indoors, for I thought the lens itself, this specimen was simply useless. Even with Aperture 5.6, the photos were not really keen to call on both the D 90 as well as on the D 7100.
The lens is therefore immediately zuück to Amazon. In an exchange I renounce. Apparently you really have a Sigma lens buy directly from a local dealer to test immediately can, whether it is useful or not.
Addendum: The settlement via Amazon proceeded without complications.
On Friday (12 April 2013) in Frankfurt was a photo exhibition where was also a sigma level. When asked about the high failure rate of employees of Sigma confirmed outright the problem, but said that with the new Serie A all would be better. The quality control have improved considerably, Sigma wanted to work on his poor image in this regard and it would improve significantly now. In the new series that was already being felt
