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Allan , Hi Mate, you can down load the tutorial for nebulosity from Craig Starks web site . It gives a good explanation on the method of taking flat frames and bias frame images in this document.
As I said in the PM Check the intesity levels in Pixel Information in the image menu in Nebulosity but use the levels in the bottom half which gives Max for the entire image... Keep it around the 9000 mark and you must use Bias frames or the flats are a waste.
Cheers.
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