Greg Nowell said:
I don't know if this is what we call "pincushion" but holy mama. It is the most dramatic eyepiece distortion I have ever seen.
[snip]
To my mind, this puts the very modest XW 20 field curvature, which in some instances is not even readily detectable, in a proper perspective.
Yep, that's pincushion. I'll offer a different "perspective". First, I found the distortion noticeable but not so bad as you describe. The distortion in a Panoptic 24 makes it less than ideal for panning around, but the problem stops being obtrusive in DSO observation when you stop panning and start observing. To me, the field curvature of the XW 20, on the other hand, is an unsolvable, perpetual nuisance in faster scopes.
--
Mike
