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instead of doing high tech math i just turn off the drive and count how many seconds it takes to move accross the field of view.
given a star moves 15 arc seconds per second you will get the exact amount of movement and size of your frame.
2 arc seconds would be just scintillation.... seeing....the effect of the different temperature layers and movement in the atmosphere,
any movement will have an effect on images its just a matter of degree of acceptability.
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