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Silv, good article. But the article doesn't say it is for f/6 and slower scopes. It just states that it works with an 80mm f6 refractor, not that it is not suitable in a faster instrument.
I regularly use my 9mm in my 8" f/4 newtonian and find the image to be fantastic. Sure there is a small a punt of astigmatism right at the very edge, but an f/4 scope will test any eyepiece. You also need to make the effort to look for this too, otherwise you'd miss it too. Coma isn't a concern at this EP focal length.
In my 8" f/10 C8 it is tack sharp to the very edge, but that's to be expected in an f/10 scope.
The 6mm is the weakest model tough. It still tears strips off a 6mm plossl, with the same eye relief as the 9mm.
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