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How many subs is too many subs?
Howdy All,
Just trying to understand the whole multiple subs thing.
I see some people are taking a huge amount of subs with the same timing and ISO. I can understand the taking of subs of different lengths and maybe ISO so you can use them for masking etc. but the use of images with the same length/ISO does do my head in a bit even though this is standard practice.
Lets say I take a 60sec/800 iso image of M42. Why not just use that same image 20 times in your stacking program? Is it not the same data if I take it once or 20 times?
Admittedly I am yet to understand what 'magic' goes on with the software when stacking like images so I might be missing something quite basic here. Is it just noise reduction that is the benefit?
Otherwise what is an optimal amount of subs?
Cheers
Dave
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