Quote:
Originally Posted by blink138
ta lewis and marc
ok so i can do the darks anytime just hook the ccd into the computer, fire up the TEC and voila get darks, no focus
lewis i thought i may need a lightbox for this to do properly
............... so flats need same (ccd?) orientation, precise focus TEC on?
lewis do you leave your TEC on til morn?
marc how do you scale darks down from 20 mins to match a different exposure, this is great!
pat
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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.