Canon S40 Auto white balance doesn't override filtration

Discussion in 'Digital Photography' started by bay area dave, Jun 6, 2004.

  1. I just dug out my 35 MM camera filters and placed some
    slightly blue and slightly orange filters over the lens (not
    at the same time, of course). I thought the auto white
    balance feature of the camera would bring the image back
    into proper white balance but it doesn't! What am I not
    understanding about this feature? I have no complaints with
    the camera's white balance when used without filters.

    If I switch to manual white balance, the camera correctly
    compensates for a pale filter (such as an 80C), giving me
    accurate color. Do other models or brands automatically
    adjust the color back to neutral when a lightly colored
    filter is placed over the lens?

    bay area dave, Jun 6, 2004
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  2. bay area dave

    Ken Weitzel Guest


    Just tried the same thing, with three different
    cameras (all Oly's)

    Same thing, they don't even try.

    Ken Weitzel, Jun 6, 2004
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  3. bay area dave

    Bruce C. Guest

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    Bruce C., Jun 7, 2004
  4. Your filters may be changing white balance beyond the range over which
    auto white balance is designed to operate. If your orange filter,
    combined with the ambient light, is more orange than incandescent light
    would normally be, it's perfectly legitimate for the camera to decide
    that this isn't simply reddish light, that you're actually using a
    filter, and it should leave the image alone.
    So the range of manual white balance is larger than that of auto white
    balance. Is this surprising?

    Cameras with auto white balance ought to be prepared to balance out a
    range of illumination that goes from incandescent lamps to outdoor shade
    with a clear sky. Anything beyond that is likely to be haphazard.

    Dave Martindale, Jun 7, 2004
  5. thanks, Dave. your explanation seems plausible.

    bay area dave, Jun 7, 2004
  6. Isn't the white balance sensor external?
    Brian C. Baird, Jun 9, 2004
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