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formula
yes there is
pixel scale = 205 . pixel size / f.l
so
pixel size = 2.5(upper limit arc.s/pixel) times f.l (560mm @f2) /205
interestigly i picked up another thread revealing for hyperstar imaging aim for 0.5 - 1.5 arcseconds per pixel which the math reveals around a 4.5 micron size
be careful
pat
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