Question about Canon Rebel XT / EOS 350D Digital Camera
I shoot mostly at night. Long exposures, star trails, etc. When I shoot anything longer than half a second, the camera takes just as long as the exposure took to show up on my preview screen.
Ex. I shoot a 5 minute exposure at f/4.5. From the moment the shutter closes, it takes 5 minutes to write. Same goes if the exposure is 5 seconds or 5 hours. It always takes the same amount of time.
I know this isn't supposed to happen because other when I've shot with other canon digital rebels, they do not have this problem. It isn't the speed of the card, either.
IIRC these cameras support a noise reduction feature through a custom function. The camera will take a second exposure with the shutter closed (i.e. against something pure black) to see which pixels in the camera are "hot", and then will use that information to remove that hot pixel noise from the original image. "hot" pixels depend on temperature and exposure length so the camera would need to do this on every shot.
Posted on Mar 18, 2008
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