Originally Posted by
Jeff Donald
I actually own the mkII. I had the 17~35 originally and it performed poorly at both ends, so to speak. But the resolution was terrible in the corners at 17mm. It was a good lens from about 20mm to 28mm and stopped down to f/5.6 or f/8. I skipped the mkI 16~35mm because I didn't feel it was much better than the 17~35mm. During the interim I tried several copies of the 17~40 and was not happy with any of them at the wide setting. When the 16~35mm MkII came out I tried it and found that the wide end, 17mm to 24mm, was better than any of the previous lenses I'd tried.