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I've taken up on Howie's approach of using modified DSLRs (450D, 550D) for near-live viewing. He uses EOS utilities to capture and astrotoaster to do live stacking. You can pre-load flats and darks if needed (I"ve been doing this on my SCT when using focal reducers as the vignetting is significant).
Here's two shots on my refractor from earlier this month. 60sec exposures stacked 4 - 6 times in astrotoaster. These are the live saved shots, no post-processing (other than squeezing into jpgs). You generally see the image after the 1st exposure, anything extra is bonus noise reduction. I thought you would have to, but you don't need to push the ISO too hard - these were iso1600.
Lagoon/Trifid and dumbell
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