At what point does this principle take effect? Assume a 14.5" f/4.3 dob for this example. Can I expect to be able to use a 3-6 Nagler zoom without my glasses, and not have my astigmatism affect the view? (That would be about 317-528x without a Paracorr, with exit pupils going from 1.2 down to .7)
Is there a formula relative to exit pupil that gives an answer? Is it variable based on the amount of astigmatism one has?
Thanks, and if I need to provide more info, let me know. Obviously, I'm wondering if I should buy a 3-6 Nagler zoom - it doesn't have enough eye relief for use with glasses, but it has plenty without.