Quote:
Originally Posted by Shiraz
that makes sense.
But, if I take 100 x 1second subs and a 10 second burst of bad seeing come through, I have 10 bad subs- wouldn't they then stuff up the final stack just as much as the same 10 seconds of bad seeing would stuff up a single 100 second sub? - I didn't discard any subs in this exercise.
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Those 10 subs shouldn't make too much difference, they may a tiny bit but certainly not to the same extent.
When stacking a lot of short exposures together, they must be registered for small wobbled between each sub. I also wonder how well star registration works in fraction of a pixel changes in short subs. Maybe a large stack of short subs can be almost as bad as a large stack due to an inability to correctly register such small changes in stellar location. Someone else will know more about how small of a movement the PI Registration can work at.