Quote:

---

Regardless of aperture, a 2 mm exit pupil.

Bill in Flag

---

I like this approach as it's easy to compute --
(eyepiece focal length)/(telescope f-ratio) and 2 mm generally works out fairly well.

If the seeing is good, though, for galaxies I'll look for detail using a 1.6 mm exit pupil and for smaller planetaries and globulars a 1 mm exit pupil (using my 18-inch Starmaster).

--------------------
Steve Gottlieb
18" f/4.3 Starmaster
Adventures In Deep Space - New article on MASH planetaries
7500+ NGC/IC Visual Descriptions
NGC/IC Project

Post Extras