Quote:
Originally Posted by Atmos
For the darks, as long as temperature, ISO and exposure time are the same as the lights, it doesn't matter whether they are connected to the telescope or not. There is of course ways of scaling darks for shorter exposures BUT there is the chance that this method can actually introduce more noise so you are better off just capturing the darks correctly. PixInsight does the calculations to scale it down, it is not something that you do manually.
With the flats they should be at the same orientation as the lights because what you are trying to correct for is the flat illumination error of the telescope to the CCD sensor. The larger the sensor the more important that this becomes on most telescopes as it is usually beginning to encroach on the corrected imaging circle.
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the flats explanation makes perfect sense thanks colin
pat