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The DBK618 is much more sensitive than the DBK04 -- approximately 2x the frame rate for any given target.
I own the 618. The firmware version mine came with gives no gridding or onion ringing at any frame rate (incl 60 Hz), but there is a subtle vertical artifact at 30 fps. This is not a problem after stacking, as long as there is some dither in the framing.
In practical terms, I think the 618 model is a better camera.
-Ivan
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