Hi Alexander!
Well, when you see something, that's the result! The link I posted earlier of the LVW's was not done by me, it was done by another astronomer, and I thought I would pass that info along.
From what I have saw in the LVW's, the views of stars were pinpoints right out to the edges with superior transmission in my 10" f/4.72 when I did own the 8mm Orion LVW and also tried a 22mm and 17mm LVW.
All three of them showed perfectly tight stars with excellent transmission, albeit a bit of lateral color. I had a 13mm Hyperion and an 8mm Hyperion and the edges showed some edge aberrations. The 13mm has some field curvature, which obviously comes from the mirror and maybe a bit from the eyepiece as well.....not 100% positive on that one.
If you see field curvature in an eyepiece, I believe it is always coming from the mirror no matter what eyepiece you use, ( I think?), but some eyepieces will show this more than others. If you see astigmatism in an eyepiece, it is the eyepiece at fault. I believe the "fishbowl effect" comes from rectilinear distortion.
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Even if at the extremes the FOV the stars didn't remain pin point, any softening in the Hyperion happened beyond the field stop of the LVW.
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The LVW's and Hyperions almost have the same apparent field of view.
LVW's = 65°
Hyperions = 68°
As to your post: If it makes you happy to see what you saw, that is the bottom line and that is all that matters! if I or someone else sees things differently, it really doesn't matter! I wish you well, and hope you had a great observing session! Having a 17.5" f/4.5 is a great light bucket to have and I would hand over ALL of my eyepieces and keep just ONE just to own one of those size telescopes!
You sure do have a nice size scope there good sir!
Have yourself a great weekend and may you enjoy thousands more nights looking through that incredible light bucket!
Cheers,