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I have both the DMK21 and the DMK41 firewire versions.
Other than the hassle of getting 6 pin firewire connections to the laptop and external 12V supply - they are very good.
I usually image Ha solar and spectroscopy.
To me the frame rate is nice but can be over riden by exposure settings.
ie if you want a stack of exposures for DSO's etc (or in my case faint spectra) you can pump up the exposure to minutes per frame.
For Ha solar I find most of my exposures are around 1/120s for the surface detail and up to 1/11s for the proms.
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