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Hi Rick,
Hyperions/Stratus eyepieces are NOT designed for Newtonians. These work best in refractors, SCT's and Maks.
You will see field curvature, pincushion, blackouts, as some of the aberrations if you use them in Newts. There is nothing wrong with these eyepieces - this is what happens with eyepiece design matching a particular shape of focal plane.
The one exception is the 5mm Hyperion. It is excellent in Newts, even down to f/4. I've had all but one of the Hyperions, and I've seen their performance - great, just not in Newts.
Many people use the different Hyperions with Newts. Most people are just not aware of the optical mismatch and so are happy with them. But, since you asked here, an there is a lot of experience here in IIS, I'd suggest you look at other designs. Sadly, the better the optical match with Newts, the more expensive these eyepieces tend to be. But, if you are not wanting to break the piggy bank, and are after some reasonable performance, look at the 30mm, 20mm and 15mm GSO Superviews. These all have an AFOV of 68*, and do very well in Newts for their price, and have great eye relief. The 30mm is a 2" fellow - you won't find a 30mm eyepiece with a 1.25" barrel give a 68* AFOV.
Plossls work very well with Newts as they are an optical match, but this is with slower Newts. f/5 and faster begins to test the plossl design.
Alex.
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