I never saw a difference in visual performance when I had my Edge HD vs standard SCT. When looking at planets or double stars or most objects where you center the object in the field of view, you wont notice any difference.
Even in big open clusters I saw no difference.
For a while, I tried to convince myself there was a world of difference in the Edge vs non Edge visually. There wasn't.
If there's a difference visually, I never saw it and the people I observe with never saw it either.
Visually, the visual Edge difference is extremely visible in the forums. When you get out and actually use your gear, you wont notice any difference. Then again, I tend to keep objects I look at in the center of the field of view.
I did know a guy online that use to say he had an alt az mount without tracking and he would let objects drift to the edges of the field of view before repositioning his object. This may be where the Edge visually is advantageous.
I use good eyepieces from TeleVue and Explorer Scientific. Even my Standard XLT SCT's are extremely sharp at the edges.
I don't do astrophotography however and I think the eye of the camera can see many things we don't notice visually.
Some people see much more then I do, so I cant dispute what others say they can or cant see. Some swear by the performance advantage of the Edge. Some people notice field curvature but I never see it also. I'm glad I don't have that type of vision.
Edited by aa6ww, 15 August 2019 - 11:05 AM.