Offensichlich I was lucky - my copy delivers very sharp images at all focal lengths, even at maximum aperture. Ok, at 8mm is required at the edges with maximum aperture a little willingness to compromise. But that's ok for this focal length in my opinion. Of course, show up on the short end of the focal length considerable distortion at the edges or corners - but that's just the short focal length due to central perspective, Physically, because just reached with the correct perspective Abblidung limits. Auto Focus is accurate and sufficiently fast. Anyway, the lens is great fun, you can still get things in the picture that are simply not possible otherwise. And that. Without too much distortion (as else at Fisheyes) Whether in confined spaces or other cramped quarters -. Just great what the Sigma delivers as Who the distortion at the edge still too large ISND can correct later almost to perfection with simple means. Only the light intensity is somewhat limited for indoor shots. The short focal length makes flash photography with direct lightning almost impossible. Therefore, I use 2 or 3 abgestezte flashes, indirectly against the ceiling, with remote control (cheap China Blize), results are so great. In short: do not come cheap, but unbeatable focal length range with good sharpness and distortion acceptable.
