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Gday
As I understand it binning is what the camera thinks the pixel size is. A 1 x 1 binned image means you are imaging with individual pixels. 2 x 2 means you are combining 4 pixels to work as an equivalent larger pixel with each side measurement equalling 2 pixels.
From memory when my camera arrived the tip was that a 2 x 2 binned image will catch fainter nebulosity, galaxy arms etc with an equivalent loss of resolution
Maybe a simplistic explanation but I am pretty sure this is the extremely basic description of it.
Mark
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