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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 05 Oct 2009 (Monday) 13:53
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Can a scratch focusing screen cause AF focusing problem?

 
psxindo
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Oct 05, 2009 13:53 |  #1

I'm using a 30D.
The focusing screen and the focus point screen in my 30D is scratch.
Could that be causing focusing problem?


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PacAce
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Oct 05, 2009 14:00 |  #2

No, because the light used for focusing does not go through the focusing screen. The AF components are located on the floor of the mirror box and not housed in the pentaprism housing.


...Leo

  
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Cadwell
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Oct 05, 2009 14:01 |  #3

What Leo said. The focusing screen is not in the light path to the AF sensors.


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psxindo
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Oct 05, 2009 14:21 |  #4

so the the screen with the AF points would also not affect the focus?

thanks


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PacAce
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Oct 05, 2009 14:59 |  #5

psxindo wrote in post #8765409 (external link)
so the the screen with the AF points would also not affect the focus?

thanks

That is correct. They're just visual cues so that you'll know what you're focusing on.


...Leo

  
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Jman13
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Oct 05, 2009 15:28 |  #6

Now, if the focus screen is out of position (not just scratched, but not sitting the right distance, or shimmed properly), it will affect manual focus accuracy, but not autofocus.


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psxindo
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Oct 05, 2009 15:33 |  #7

Thanks. That helped


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Can a scratch focusing screen cause AF focusing problem?
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