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Originally Posted by ausastronomer
75cm is 30" how much bigger do you want it ?
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Well, that's almost big enough!
You need to have magnification of about 120x or more to get all that light in your eyeball.
I suppose a 1-1.2m mirror might be in order for specialised visual use (fainter galaxies & planetaries) in the 200x+ range.
Any bigger than that is for CCD/astrophotography use only.
