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Old 28-09-2020, 07:16 AM
glend (Glen)
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Join Date: Jun 2013
Location: Lake Macquarie
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It depends. Each image that you take will contain some noise elements. In theory you will capture the same amount of signal data, and so cumulative signal will be equal. Some extremely low noise cameras are very good at building up images using short sub exposures, others not very good, so it depends on your camera choice and especially if the camera has effective cooling to minimise thermal noise. As an example, a very low noise camera, like the ASI1600 MM-C, works very well shooting lots of short sub exposures, and this is a valid way of over coming mount or guiding issues as well.
Just a comment on the post below, AMP glow is (at least for the 1600) easily processed out, and short sub shooting can lessen reliance on having to capture and process Darks. Cameras like the 1600 do not require Dark processing for sub exposures at or below 30 seconds, simply applying Bias frames will take care of that. As far as well depth is concerned, it can be somewhat irrelevant in short sub capture, as you are not exceeding available depth in many cases; but obviously sensitivity is important. At the risk of setting off a major debate here, let's just say it can be done if you pick the right camera.
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