No one would suggest an ortho for an object as huge as the North American nebula. Planetary targets are very small, and you just don't need a super-wide field to see the planetary disk. Deep-sky objects are what the Naglers (and all super-wide-field eyepieces) excell at. Rich pointed out the seeing factor and he's dead-on. To get perfect imagery, you need perfect seeing. On a night will less than perfect seeing, the Naglers will probably perform just as well as the ortho. In that case, the optics aren't the limiting factor. On Fri, Jul 31, 2009 at 2:13 PM, <erikhansen@thebluezone.net> wrote:
Naglers are not for everyone and or every object, they excel when a wide field is wanted. They do not offer too much advantage with the 32" Grim for instance. I have a 6"f5 refractor and a Nagler offers excellent views. It is always impressive to see the Veil and N. American in a wide view.