Canon 17-55 impressions (vs 17-40)

Started Jun 17, 2006 | Discussions thread
s e a n New Member • Posts: 4
Re: Canon 17-55 impressions (vs 17-40)

Hi, i had my 17-55mm f2.8 IS USM lense for nearly 2 and half months. and just got my 400D not long ago, now i having a difficulty doing the focusing, compare to my previous Sigma 18-50mm f2.8 on my 350D. i found that either is problem with my lens or my camera or some setting that i miss off. or perhaps is the sensitivity of 9 AF points. Its focus clearly on one spot. but not others. and i couldn't work out to have it "clear focusing" on average. try to go f3.5 and so on. but still. can anyone please advise. thanks

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