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Hi,
I own the 8.5mm Pentax XF and an 8mm Televue Radian. I use them both in all my Scopes. The 8.5mm Pentax XF is an exceptionally high quality eyepiece and worth every single cent of it's price. It has excellent eye relief and optical performance. I would rate it as slightly superior to the TV Radian in all criteria. It is a clearly better eyepiece than the 8mm Hyperion.
They are made in Japan
Cheers,
John B
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