Question about UV filter -- Canon Lenses in photography-on-the.net forums

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Location: Rome, Italy

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Feb 13, 2009 14:51 | #1

Hi everybody, I have a question; can a Uv filter (Pratika filter, manufactured by BW) cause such a back focusing effect?
MF:

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AF:

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Atm there I have no chance to test it out, since both my camera and the 100 f/2 were sent to canon assistance because of this damn' back focusing problem

And the previous owner of the 100 F/2, ensured me that the lens was working fine with his 5D and had no issues with it

Thx everybody!

Flickr Canon 5D - Canon EF 17-40 f/4L - Canon EF 135 f/2 L - Σ 50 f/1.4 EX

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mrkgoo

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Joined Aug 2006

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Feb 13, 2009 15:07 | #2

No, I don't think it can. The autofocus mechanism is in the body, so unless the UV filter is changing the focal point of the lens (doubtful), it shouldn't effect how a camera focuses. Even if it did (like closeup filters), I'm not sure it would affect how much the AF will tell a lens to move to focus.

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number six

fully entitled to be jealous

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Location: SF Bay Area

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Feb 13, 2009 18:26 | #3

Nope.

"Be seeing you."
50D - 17-55 f/2.8 IS - 18-55 IS - 28-105 II USM - 60 f/2.8 macro - 70-200 f/4 L - Sigma flash

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