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From memory the calcs are you want a star image about 4-5 pixels across so it doesn't appear too blocky or too big. At 4 arc seconds seeing, that relates to roughly 1 arc second per pixel.
2500 x 0.63 = 1500mm so 1 arc second over this distance is
1500mm x tan(1/3600) = 7.27 E-3mm so about 7µm.
I'd suggest 4-5µm (web cam) to 10µm would be in the range.
Al.
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