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the other little point about short exposures is in capturing the seeing. Short ones may get you a star with a big enough scope or pointability, but it is still a point instant shot that the centroid calculation algorithms will chase a lot with anything but great seeing. If you should only be providing guide inputs at > second intervals, why not make the photo the same length and 'smooth' the guide requirements a little.
Wow, i've done a bit of guiding but have only taken two photos - how sad am I!
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