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I think Dave's points were more about mono vs colour..
The uncompressed high frame rates are still a reason why the colour DMK would be better than the colour ToUcam. If the seeing is only 3/10, with uncompressed high frame rates, you've got a much better chance of capturing frames in moments of good seeing - even if the air is generally unsteady that night.
If you're capturing 3 times more frames in the same period of time, chances are you'll get more chance of capturnig enough sharp frames to stack.
The other advantage is noise - from Chris Go's reports, the DMK's have far less noise than the ToUcam, and he regularly captures at 80% gain and ABOVE. Try doing that with the ToUcam and see how grainy it turns out.
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