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Focus for manual white balance?


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#1 Bernhard Walzl

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Posted 23 March 2011 - 08:15 AM

Hello!

I recently had a discussion about manual white balance and we did not came up with a right answer.

When performing a manual white balance on a camera, one holds a white board in front of the camera. The question is: Has the board to be in focus?
Of course it is rather difficult to focus on a totally white surface but there are scratches, borders, etc.

Please explain your answer briefly.

Thank you for your help,
Bernhard Walzl

Edited by Kapabel, 23 March 2011 - 08:15 AM.

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#2 Brian Drysdale

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Posted 23 March 2011 - 09:21 AM

Focus isn't important, but it can't be over exposed, that's important
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#3 Phil Rhodes

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Posted 23 March 2011 - 10:35 AM

Most cameras will complain if it's overexposed - mine says "AWB NG OVER", for instance (or UNDER for the opposite circumstance).

Oddly, professional cameras tend to refer to manual white balance as AWB or "Automatic White Balance", because it's more automated than manually selecting RGB gain, gamma and pedestal... the sort of thing that domestic cameras call "auto white balance" is usually ATW or Automatic Tracking White.

Here endeth the Phil trivia lesson.

P
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#4 Adrian Sierkowski

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Posted 23 March 2011 - 11:44 AM

In the name of the Phil,
the Not so Phil,
and the Full of Phil,
Amen.
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#5 Brian Drysdale

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Posted 23 March 2011 - 12:12 PM

In the name of the Phil,
the Not so Phil,
and the Full of Phil,
Amen.


Yeah, just quicker to avoid having a camera back chatting you with messages.
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#6 Paul Tackett

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Posted 28 May 2011 - 03:29 PM

Focus on the corner of the board. Then move the camera to the center. This is how I have always seen it done.
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#7 Patrick Cooper

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Posted 05 June 2011 - 09:01 AM

It shouldn't matter if the white sheet or board is in focus or not. Though I do have a video camera instruction manual that cautions that the white object in question may not be focussed when brought close to the lens during the setting of the white balance. Of course it's silly to say such a thing as this will have no impact on the white balance.
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