"Jim Beam" wrote in message
...

when does additional detail fail to appear?

I think 0.8mm exit pupil was on the table, which holds to the 31x per inch
rule. Beyond that, you are just making the image larger, which has the
double edged sword effect of also making the image dimmer (as you
suggested). So the questions are, and this is subjective, at what exit pupil
are images too dim for you, and at what exit pupil do your floaters (if any)
become a serious bother? These values will hold in any scope. You then
simply scale up the aperture, to increase image scale.

Stephen Paul