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a dark frame is taken in the dark, ie with lens cap on - the idea is to remove any undue thermal noise/heat or hot spots on the sensor that are showing up in your image. THe dark is then subtracted from the light (normal) to subtract any of the junk you don't want
the lx3 is no point & shoot, at 800 it is on pat with a cheap slr & panasonic has had trouble keeping up with production as they have been so popular for taking excellent pics
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