I like my new 17-40L on my 20D, but have found that at the wide angle, autofocus is usually off somewhat. I fix this by zooming in first, autofocusing, then zoom back out and snap the picture. The owner manual for the lens says not to zoom after focusing since it can change the focus. I don't remember this being a problem for my 28-105 I no longer have. Is this normal?
17-85-S USM or 17-40L?
in Canon EOS Mount
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