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Message: <blockquote data-quote="Geo. G." data-source="post: 3194698" data-attributes="member: 129989"><p>Generally speaking, astro-types dislike angular mag distortion and accept pincushion.  Usually the reverse holds for terrestrial (daytime) observers.  The reports I had on the Meopta suggested fairly significant AMD.   It's disturbing to watch a planet change size as it nears the edge of field, but you won't notice the problem if your scope has a drive and the target stays centered.  You probably also won't be bothered at the low powers that a  spotting scope is designed for:  pretty much, a 1mm exit pupil, or 80x in an 80-mm scope, is about the limit.  But in a 12-inch reflector at 300X you really do notice any AMD, and it's not pretty.   However, I have no doubt the Meopta is an excellent eyepiece for daytime spotting.</p></blockquote><p></p>