I forgot to mention that as well as downscaling, converting to video also involves significant compression with resulting artifacts and loss of detail, akin to using jpeg images so the resulting video is not like uncompressed avi from webcams (or ser from astro cameras) so RAW stills would be better. The downside is planetary imagers take hundreds or even thousands of frames to select the ones with good seeing to stack which would be impractical with RAW frames from a DSLR
Cheers
Robin
