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just did a simple validation test. Used 30 normal subs in one stack and then made another stack by adding 5 more subs of the same target taken with a bit of moonlight present (resulting in a stack of 35 varied subs). The brighter subs had about 4x the sky brightness of the normal subs.
The SNR changed by a factor of ~0.9 with the addition of the bright subs (ie the image was noisier). The model predicted that the SNR should change by X0.89, so I am reasonably happy that the model is OK.
In essence adding the 5 bright subs to the good stack of 30 gave about the same result as I would have got by reducing the good stack to 25. It really is not very efficient to add noisy data to good data.
Last edited by Shiraz; 16-03-2015 at 06:51 AM.
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