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The right number of images

May 2013: Let statistics work to the benefit of your pictures.
RELATED TOPICS: ASTROIMAGING
tony_hallas
Most astroimagers know that if you take lots of frames and combine them, you get better results. The classic formula states that the gain in signal-to-noise ratio is equal to the square root of the number of frames combined.

But I have found that this is too simplistic. A lot of the time, we didn’t have the best sky to work with or we misjudged exposure times. I used to think that a combination of the longest exposures and the most frames would give the best results. And in a perfect world, that would be true.

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