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Thanks Chris and Ken
I agree at the end of the day you calculate as much you like with optical mechanics and mathematics but good guiding is really dependant on seeing conditions , wind , rock solid equipment on your OTA , stable ground and a bit of luck thrown
I’m usually guiding around 1.0 to 1.3 arc sec error and can take 50 x 5 minute subs with perfect round stars ( with dithering thrown in )
I know I will never get down to 0.5 to 0.8 arc sec error with my big rig but hey I don’t need to , the images are the proof of the pudding
Thanks
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