Quote:
Originally Posted by Tandum
I'd like to know why PE is so important if your guiding.
I measured my PE while guiding and it was decimals of an arc/sec.
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Overall peak-to-peak PE doesn't matter so much with guiding, especially at short focal lengths, but the smoothness (or jaggedness) of the PE curve does matter.
If your PE makes a sudden jump - like 3 arc secs in one second - then if you are guiding with 1 to 3 second exposures with an image scale of say 1 arc sec per pixel you'll get some very eggy stars.