Sirrith wrote in post #12547048
Could you post some images to show the softness? If it is a bad copy, then you should try and send it to sigma to get it fixed, because a normal copy of this lens is very nice.
Hmm. The problem is like keeping a soap in your hand, it seems to work sometimes well, and sometimes not so well. Many times I get blurred ends or only blurred corner. I suspect it is the OS system causing the lenses not to align properly. I might not be interested to put up those pics on my flickr stream. But, I am considering giving it to inspection to Sigma repair. I though have to be certain how to explain the problem to them.IMAGE LINK: http://www.flickr.com …/35883172@N02/5818129175/ Sigma17_70DepthF4
In some pics it seems that the plane of focus is very curved, the ends of the pics are closer focused than the middle. In fact I have taken successfully pics like this, that have ends closer to the lens than the middle, where I have focused:
, on Flickr
Yes the lens is a nice combination of characteristics, quite sharp (when ever it is), near focusing, effective OS, etc. My use for this focal lenght range is though limited (I use mostly the 70-200mm) and so this lens with its problems has been left quite unused.
70D. EF 70-300mm L, Tamron 90mm F2.8 VC and Sigma 17-50mm F2.8 OS HSM.