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Thanks for the quick replies, and the calc link, a bit easier than plugging the info into SNPP6 for a FOV reference.
So, by applying the star size formula: Star Size = (Seeing * FL)/206265 = Then in average perth skies (lets say 2.5arc seconds)
Star size = (2.5 * 900)/206265 = 0.011mm = 11microns.
My understanding of the Nyquist rule was to 2x sample (correct me if wrong) therefore in seeing of 2.5 arcseconds I would need a pixel size of 5.5microns, pretty close to my current 500D at 4.7microns in terms of ideal sampling.
So I guess, I need to find a CCD with properties similar to my DSLR, weird.
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