Unwanted noise in a typical image tends to be random across different exposures whereas the desired signal is consistent. There is no hard and fast rule for the number of images required for the process but typically a batch of around 20 images is ideal, though any number over five will yield noticeable improvements. Instead of long exposures, then, astro imagers shoot as many similar images of their target as they can and then combine them into a single image using stacking. Meanwhile, images captured at too short an exposure will fail to pick up the very dimmest details in your target. These limits are set mainly by: the accuracy of your mount’s tracking the amount of light pollution and atmospheric conditions at your location the sensitivity of your camera the focal ratio of your telescope how bright the object is you’re imaging and the risk of exposing your image until the pixels over-saturate. However, there are limits to the exposure lengths you can achieve in astrophotography.
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