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Pentax 20mm XW bad points.
There's a Pentax 20mm XW eyepiece for sale on the forum. I know its a nice eyepice but what are the * bad * points of this eyepiece, especially when using it in a fast F5 ( 12" dob, FL 1500mm giving 75x magnification) ?
I have been trying to find reviews but have not had much luck finding anything that reviews this eyepiece in an F5 telescope and I dont think I'll get to "try" one any time soon.
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