I’ve mentioned here and there (mostly on Flickr) that I’ve been having some intermittent focusing issues which were most noticeable when using the Canon EF 70-200mm f/2.8L IS lens. I thought perhaps there was a lens issue of some sort, or user error, or both.
However, someone else has mentioned having similar problems with their 40D and a different lens. This, just after they had gotten the camera back from Canon — supposedly for a cleaning. In this case, the mirror appeared to have some sort of filmy haze on it.
The focusing sensors are in the prism, so, it seems reasonable that a dirty mirror or focusing screen could account for soft focus issues. As soon as I get home, I’m checking that mirror and screen!
2 responses so far ↓
Sue Izard // May 8th 2008 at 8:47 am
Geren,
I’d be interested to hear what you have found on your focusing issue with the 70-200mm. I’ve had problems with my Canon 10d body and a Tokina lens 12-24mm , as well as with a Canon 28-70 mm lens. I’m pretty hard on my gear and definitely haven’t kept it as clean as I should.
Do you know how much sending it off to Canon to have it cleaned might cost? Sue
Geren // May 8th 2008 at 11:14 am
Sue,
I have only noticed problems with the 70-200 (and 70-200 with the 2x multiplier), probably because I’m asking the world from it. I don’t notice any issues with my Tokina 12-24 or any of my other lenses. And, sometimes I get superb results with the 70-200, too! So, the issue may be me!
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