Tony,
You are headed for a world of pain with the Hyperions in your Newtonian. These eyepieces are not designed for Newts, but for refractors, SCT's and Maks. It comes to the shape of the focal plane each scope produces: Newts produce a concave focal plane, refractors, SCT's and Maks a convex. Of the entire Hyperion line, only the 5mm works well in Newts. All the others will be affected by field curvature (some focal lengths more than others), pin cushion and even astigmatism. This is not a design flaw in the eyepieces. Instead, Newts and Hyperions are not an optical match.
If you are wanting to do eyepiece projection with them, you may get away with it if you keep the planets really tight in the centre of the FOV. As for vignetting, it really is not a concern as you will be using EP projection for the planets, and the background sky will all be black - you won't see the edge of the FOV. For lunar photography, there I cannot say, but vignetting will be the least of your problems here. But eyepiece projection is the least that you do with eyepieces - you mainly look through them.
I too had bought several of the Hyperion line for use in my Newts, thinking 68° would be brilliant. What I was not aware of was as oils ain't oils, eyepieces and scopes ain't eyepieces and scopes. Optics is a bit more complicated, and unfortunately there is a steep learning curve involved - as with everything else...
When I kept seeing that the image was so poor with each Hyperion I used, and how the aberrations changed in appearance between them, I started to think that not that there was something wrong with the eyepieces (you just won't get 4 lemons straight), but that I was missing something from my understanding of the relationship between scopes and eyepieces. When I mentioned what I was seeing to a friend of mine who has a phenomenal knowledge of optics, he straight away recognised the problem of optical mismatching, and explained how scopes produce a focal plane and that it is curved, and some curves are concave and others convex, and how the radius of this curve also varies according to the f/ratio and focal length of the scope!
I have used Hyperions in refractors, SCTs and Maks since, and they are just fine in these scopes. Just not in Newts. But I do have a 5mm Hyperion which throws up a pretty good image in my 8" f/4 Newt. And the 5mm is good in Newts because the lens design is different from the others.
Note also that many people think that the Hyperion line is a "copy" or "clone" of the Vixen LVW line. They are not. They are only similar in size and the use of colour bands that are used to distinguish the different focal lengths (pretty dumb in the dark when you are using red light... they all look the same
), but other than that internally they use different lens arrangements and glass types. What Hyperions are exactly the same as are the Saxon SWA, Celestron Duo, and a couple others.
It is important to know that there are actually only a handful of eyepiece manufacturers, and that nearly ALL brands have their eyepieces manufactured by these manufacturers. Many eyepiece lens designs are actually exactly the same from brand to brand, and the only difference is the outer casing's appearance.
I know I've written more than your question asked for, but I felt it is important to know that there is more involved than just what your question alone asked about.
Alex.
. Look at the Andrews Communications or Bintel websites for these. I have one of these 32mm plossls with the threaded jacket.
