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The 7mm Pentax XW is a better eyepiece than the 8mm TV Radian IMO. It is not a lot dearer maybe $30 to $40. Radians give a very warm planetary image and a 60 deg AFOV, the Pentaxes give a beautiful cool (neutral) planetary image and have an extra 10 deg AFOV. The Pentax has better light transmission, contrast and sharpness by small margins. Don't get me wrong they are both exceptionally high class eyepieces but having used both a no brainer IMO, open your wallet a TAD.
CS- John Bambury
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