Question about Canon EOS-20D Digital Camera with 17-85mm Lens

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Focusing Problems I just bought the Canon 20d. I shot a wedding with it two weeks ago, and really liked how it performed in low light. However, I noticed a lot of my photos from the low lit reception came back out of focus. (The outdoor ceremony shots were fine). I noticed 3 issues with the images: 1-The main subject, which often was dead center and took up 1/2 to 2/3 of the frame, was often NOT in focus. Rather, the camera selected some point way off to one side or off in the distance somewhere to focus on. 2-Some photos had the subject in focus and the background soft. This is fine, however when i looked where the focusing point was in the Canon Utility program, it said that the focusing point it chose was actually NOT the in-focus subject, rather something else that was not in focus. 3-Some images came back perfect focus with deep DOF, but when I looked where the AF point was, there were NONE lit up. I was using P mode, 400 ISO, evaluative metering, an external 580 flash, single frame shooting, and One Shot mode. I also used both a 17-35mm 2.8 and a 28-70mm 2.8 Canon lenses. The reception hall was fairly low light, and sometimes the subject was moving, and sometimes it was stationary. Any ideas why my focusing seems to be all over the map? Thanks!

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Re: Focusing Problems

* Get AF off the shutter release and onto the * button using the custom function. * Use the center focus point only. Force yourself to pick what you want in focus, AF, then recompose and shoot, a habit far more effective than computer driven multiple AF points for just about everything. * AF performance degrades in low light no matter what camera you own. This is life. At least if you control the when/where of AF, you can try and choose high contrast points in the scene to focus on, points that will help mitigate the low light. * Not sure if this applies to you, but it does apply to many a pixel peeper...if something prints sharp at 8x10 or 11x14 then AF has succeeded even if it's a little off at 100% in Photoshop. AF is not perfect and the tolerances are not necessarily up to producing 40" enlargements, which is what 100% in Photoshop is. Having said that, in good lighting with good target contrast the AF on your 20D often will nail focus so perfectly that it will hold up even at 40".

Posted on Sep 14, 2005

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