The Sigma is very sharp until about 50mm and then fall off a bit. Comparing the resolution, I can’t tell the difference between two. This is not to say that the focus is bad in the Sigma. The 16-35mm has slightly more contrast in difficult situations and the focus is more reliable. Compared to my 16-35mm Canon in most situations it is difficult to see the difference in image quality. This lens to work extremely well out side and in well light areas. I have used this lens for 6 month now and brought it on the the basis of a low weight option when traveling and using 350D. All in all, a very good value for the money. I'm comparing the focus to a much more superior and read more expensive focus system. Keep in mind, I'll stick with my own advice. The only thing that bothers me with this lens has nothing to do with images, but the focus speed and noise. That's why the RAW format was introduced. Minor issues are very easily correctable. Let's all remeber that this is the digital age. Distortion is what you'd expect, barrel at wide, pincushin at long - again PTlens does an incredible job at correcting. Even so, easily correctable in PS or PTLens. Vignetting is all but non existent except at 18-22 or so. Even at wide open, it does very well producing good sharpness, but with a slight fall-off in the corners. My copy is VERY sharp, if stopped down a couple of notches. This is not an expensive piece of glass, but the value is fantastic.
Lets face it - price does reflect quality. This lens is not intended to compete with top quality glass. Most make comparisons to to top of the line L lens or primes or what have you. In fact, focus was spot on in each and every case and among many different lighting conditions and focal lengths. I thoroughly tested this lens on my D70s when I first bought it to make sure my copy was not one of those. I have read that at times Sigma may have QC issues with some of their lenses ie.
I must say that this lens has exceeded all of my expectations. I bought this lens after reading many, many reviews from various sources.
I havent got a bad Sigma lens yet, and i have had over 20 Sigmas lenses. But with 100$ i dont complain, just got compliments. This lens is still made in Japan with metal mount, comes with petal hood, uses 62mm filter size, farely fast AF, but a little noisy AF. I can buy all the lesser lenses and they would work fine, i never have worried about buying over price VR and IS lens again, because Sony A100 has built-in Anti Shake in body. But i must say the advantage of Sony DSLR is that all lens will be stabilzed when mounted, its the best feature on Sony, i havent had a single bad lens mounted on Sony yet. The lens becomes much sharper from 35-125mm, good sharpness at 18mm, no purple fringes, great price, light and compact. I finally bought this Sigma 18-125mm to be my everyday lens for use with my Sony A100, this lens will be stabilized on my Sony A100, that would helps on sharpness and anti shake, it works perfectly fine, i must have shot about 300 shots with it, most all images came out sharp and nice contrast, a little bit distortion at 18mm, but that is to be expected.on my Sony A100 this Sigma lens = 27-187mm, that is a very good all around range.
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