400D Underexposure: Metering or Sensitivity?

Discussion in 'Digital SLR' started by plastic_razor, Oct 18, 2006.

  1. Lots of discussions on internet message boards regarding the Digital
    Rebel XTi (EOS 400D) exposure. Some say it's regularly underexposing
    shots. Others say it's exposing properly, and that the previous
    iterations of Canon dSLRs were overexposing. Regardless...

    Is the difference in exposure simply because of a more conservative
    metering system on the 400D? Or is it because the new 10 MP sensor is
    less sensitive to light?

    To make matters worse, the 400D is supposed to follow a different tone
    curve than the 350D. That makes direct comparisons between the 400D
    and the 350D a bit more complicated.

    Can anybody shed a light on this subject?
    plastic_razor, Oct 18, 2006
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  2. Yes, the JPEGs are very flat and dark if you use Natural or Faithful
    colour. It picks up a lot if you switch to Standard colour, or one of
    the more vivid/specialised modes.

    The images are high in dynamic range, which by definition means they
    will tend to look flat. You can't cram more tonal range into the pic
    without compressing contrasts.

    The new sensor is certainly less sensitive, it has smaller pixel wells,
    and in physical terms that means fewer photons hit each pixel in the
    same time. It is bound to be less sensitive. The issue is never
    absolutely down to sensitivity, but to noise/signal ratio.

    I can however say for sure that 400D JPEGs, out of the camera with
    normal exposure and neutral settings, are flatter and duller than 300D
    or 350D. But the raw files have a deal of excellent information in them
    and you can extract an excellent result using a strong tone curve.

    David Kilpatrick, Oct 18, 2006
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  3. plastic_razor

    Peter Wehle Guest

    Well, i own a 350D since May `06 and in my opinion she`s a little
    overexposing. I only use the P position for standard photos. But one can
    get it under control :). For I let her save RAW and JPEG simultaneously.

    Greetings, Peter (Berlin)
    Peter Wehle, Oct 18, 2006
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