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This is a test of an old beat up 17-35mm f/2.8 against a 28mm f/2 AI-S and a 28-200mm f/3.5-5.6 and I would say it failed. The first shot is the center, the rest are the 4 corners. You can see in the file name [17_2.8_17-35] is the 17-35 lens at 17mm and f/2.8, [28_2.8_28] is the 28mm prime, [28_5.6_28-200] is the 28-200mm zoom at 28mm and f/5.6. This sample was 'bargain grade' used for $819, it is really beat up & scratched which doesn't bother me, the glass is flawless but the focus ring makes scraping sounds and has an uneven feel. It looked to my eyes like it was not autofocusing correctly some of the time and the tests show it consistently looking awful wide open at f/2.8.