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Hi Graham,
I have one which slots between my 7mm and 10mm Pentax XW's, for use in an 18"/F4.5 Obsession.
An absolute cracker of an eyepiece and almost the equal of the 7mm and 10mm XW series.
Highly recommended irrespective of cost, but at the value price of about $200+ it represents exceptional value. It is a superior eyepiece to the 8mm TV Radian and the 8mm Hyperion/Stratus IMO.
Cheers,
John B
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