7D + 100-400L, trouble focusing (AF)

Started 4 months ago | Discussions thread
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ryanbatc2k9
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7D + 100-400L, trouble focusing (AF)
4 months ago

I rented the 100-400L for our airshow this year which almost didn't happen because of poor weather.  When it finally did happen, I had serious AF problems, especially in the one shot realm with the lens set to IS mode 1.  I didn't have any issues two years ago (w/100-400L) with sunny blue skies and my old Canon XTi.

I'm wondering what I'm doing wrong?  Is it me and the camera, me and the lens, or just the camera or the lens?

F22 was fairly close to my position (about 2000ft at the most), and I see plenty of contrast, yet the camera would not focus...  at this shot I think I was in One Shot AF and mode 1 IS on the lens.

Canon EOS 7D
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