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This video illustrates how inconsistent exposures are with a DSLR (40D, right) as compared to a compact camera (S3), causing flicker to be a huge problem when using DSLRs for time lapse photography. Camera settings were identical (P mode, auto ISO, evaluative metering. Viewfinder on 40D covered.). What is the source of this inconsistency?
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  • Dave A 2 months ago
    The only variable I see that is left could be the Noise Reduction-- on long exposures many DSLRs will take a second shot to sample the noise pattern, and then subtract that from the first image to get the noise reduced one.

    Just a shot in the dark, but I wonder if you turned off the noise reduction if there would be any difference? It seems improbable, but with every other variable taken care of, who knows.
  • Poul Jensen 2 months ago
    It doesn't appear to be in-camera processing either. I uploaded another video with both cameras shooting RAW, and the result was the same. Thanks for the suggestion though.
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  • ßlϋeωãvε 2 months ago
    I was going to suggest covering the SLR's viewfinder, but now see you did that.

    I usually manually set the ISO on my cameras, never use auto. Have you tried that with the SLR? And try aperture-priority mode.
  • Poul Jensen 2 months ago
    In my experience, anything but full manual settings causes flicker. I uploaded an aurora video (vimeo.com/1739926) with exif superposed; camera on aperture priority. Big variations even when exif says exposure time should be constant. :-| BTW, I also uploaded a different version of this video w. exif superposed, showing that ISO stays constant for both cameras.
  • ßlϋeωãvε 2 months ago
    OK, have you tried a TL with less sky in the frame? Perhaps a dSLR's exposure system is more sensitive to the slight luminance variations in the clouds.
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