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70-200mm f/2.8 focusing problem help!

post #1 of 12
Thread Starter 
Hi guys, my telephoto lens has recently started acting up and has developed what seems to be focusing issues. I can't seem to exclude it down to a single circumstance but it seems that when i'm at the long end and I try to focus, it just results in a very very soft photo. I understand that at the end its going to end up at Canon but i'd like some insight into what is actually happening here.

I've tried multiple camera bodies and lens so the problem is isolated to that specific lens. Below I have attached sample pictures using my backup camera body, first three were taken at the long end while the last one was taken at 70mm.

Thanks



Aigo
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Aigo
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post #2 of 12
That is very strange...did you drop it bump it or anything?
post #3 of 12
Thread Starter 
All i remember is a small 40cm drop while it was in its lens case onto a wooden floor but if thats really what did it.... reviewers keep saying that the damn lens is built like a tank and everything...
Aigo
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Aigo
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post #4 of 12
That is definitly it then...one of the elements got moved. All you can do is send it in. Is it on warrenty...you may be able to get it fixed for free if you are a good talker.
Edited by Sean Webster - 6/11/11 at 12:25am
post #5 of 12
Quote:
Originally Posted by Enthusiast View Post
All i remember is a small 40cm drop while it was in its lens case onto a wooden floor but if thats really what did it.... reviewers keep saying that the damn lens is built like a tank and everything...
"Built like a tank" does not extend to dropping it onto a hard surface.
post #6 of 12
Yeah, they're built extremely well but a hard impact is going to move stuff and even slight movement of an element can cause some pretty bad results.

Do note that even if it is under warranty it is not covered if Canon finds that there was impact damage.
SFF Goodness
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post #7 of 12
I would agree, no reason the lens wouldn't focus except if the elements inside shifted angle during an impact.

I don't think the warranty will cover that, at least for free, except if they think that the lens was like that while leaving the factory. Though that would be lying.
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post #8 of 12
Decentered elements are fun! Have fun with the repair bill, its gonna cost probably around 2 GTX 480s.
post #9 of 12
Just to rule out the obvious, you don't have a cheap UV filter on it, do you?
post #10 of 12
Also, can you change focus compensation on your body? Try to dial it back (or forward) and see if it helps at all.
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