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8" sct/low power eyepiece vignetting?
After finally being able to see the Helix nebula with a Televue nebustar filter on a 27 panoptic, I'm considering getting a 50 to 55mm eyepiece to get greater image brightness for large dim DSO's. Some of these eyepieces will vignette and some will not. Am I correct in thinking that the view through a vignetted eyepiece will be just as good as that through an eyepiece that exactly matches the scope, assuming identical parameters other than AFOV? In other words, I just don't get to utilise the extra potential field of view of the vignetted eyepiece?
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