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Hi,
The Hyperions are Chinese manufactured clones of the Vixen LVW's, which are a superb eyepiece.
These and many other high end eyepieces (Pentax XW, Naglers, Radians etc) use a telenegative lens set (barlow) inbuilt into the base of the eyepiece in front of the field lens group. This gives some people the impression they will not barlow well because in essence the eyepiece is being "double barlowed". It will give a miniscule drop in light throughput compared to a high grade specialist planetary eyepiece like an orthoscopic or plossl because you now have 10 lens elements (8 in the eyepiece, 2 in the barlow) compared to 4. Most people would never detect this light drop. Keep in mind that the Hyperion, or any 7 or 8 element eyepiece for that matter, is down marginally on an ortho or plossl in any case because of the extra lens elements.
In practice I have found that if you use a good quality barlow, these eyepieces barlow very well. The Televue 2X barlow is an excellent barlow and the combination will barlow very well. Just be aware that any "standard" barlow, including the Televue 2X, extends the eye relief of the native eyepiece a bit. The Hyperions starting with 20mm of eye relief will be pushed out to about 23mm or 24mm and you may take a few minutes or a bit longer, to get accustomed to putting your head and eye in the right place to hold the exit pupil and avoid blackouts. The Televue Powermate series preserve the eye relief of the native eyepiece and avoid this issue.
The Hyperions are the best value for money eyepieces currently available, offering performance just behind the premium eyepieces and the Televue 2X is one of the best barlows on the market.
I think you have come up with an excellent solution.
Cheers,
John B
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