Hi Rick .
The raw optical performance of many stardard plossls and orthoscopics say, as has been mentioned, or even that 9mm Bintel/GSO plossel that comes with a lot of GSO dobs, it's central sharpness, is probably just as good as anything out there! I know as I have used and compared it many times with all my exotics!
People like myself and Alex, Profiler, Bill Paolini, Don Pensack esp, etc, know, as we have used and tried a lot of exotic eyepieces , and can thus give you some advice before plonking down your hard earned cash;You'll pay a hell of a lot more just for AFOV, and comfort!
Cheers bigjoe.
