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Interesting post Mike,as I image at 2000mm with a small pixel camera seeing affects me every night. I often start a imaging session with poor seeing then shift to better then it may deteriorate then improve again. A quick glance at the dec. guiding graph tells all if the corrections are greater than R.A. If the seeing is poor but not very poor I switch to a colour filter and reduce the star sizes in image processing the RGB. On those great seeing nights take all the Luminance I can.
Clear skies Ken.
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