50D autofocus failing?

Started Oct 13, 2012 | Discussions thread
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50D autofocus failing?
Oct 13, 2012

I've had a 50D for a few years and have been quite happy with it. However, lately I've noticed that autofocus seems to hunt and never quite lock on with the far left and right focus points, in less than ideal light situations at wide angle. In good light and high contrast conditions, it locks on as snappy as ever, but performance has definitely decreased in low light / low contrast situations.

I've noticed this with both my 15-85 and 17-40 f/4L at 15mm and 17mm. For comparison, my 5DII locks on in the same conditions without hesitation @ 17mm with the L lens. Longer focal lengths don't seem to be affected.

Has anyone had a similar experience with their camera? I was considering having everything cleaned at a local camera shop in hopes that it would fix the problem. Anyone have any thoughts? I was also messing around with Magic Lantern and a firmware update around the time I first noticed this, and was wondering if I messed anything up because of that...

Any feedback would be appreciated! Thanks!

 NotDavid's gear list:NotDavid's gear list
Canon EOS 5D Mark II Canon EOS 50D Canon EF 28mm f/1.8 USM Canon EF 400mm f/5.6L USM Canon EF-S 15-85mm f/3.5-5.6 IS USM +5 more
Canon EOS 50D Canon EOS 5D Mark II
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