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?
UPDATE: The source is that DSLRs change exposure in relatively big steps, for the case of Canons 1/8 EV on automatic settings. Canon compacts on the other hand appear unique in changing exposure in much smaller steps, ~1/32 EV, on automatic settings. Above video shows what difference that makes. DSLRs COULD do the same if manufacturers would adjust the firmware.