t (Ratboy99) wrote in message ...
I read different numbers for how much you can milk out of a specific
aperture. I am considering a 7" APO.

I own a few apos ranging from 3" to 8". I find that for low contrast detail ON
JUPITER that 30x per inch shows just about all an aperture has to show.

This is due to a combination of diffraction effects from the aperture, as well
as defects in the eye.

When it comes to double stars I am basically able to double this figure to get
the max resolution from an aperture due to stars being point sources, and not
as affected by either diffraction in the aperture or defects in the eye.

I don't see how diffraction affects one and not the other, Rat.

Andrea T.