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  1. J

    2 inch barrel dia. eyepiece for Pentax scopes - Caution, long post

    I use my 13mm Televue Ethos with 100° AFOV in my PF-80ED to view birds in my backyard but does not reach infinity focus because it has a 2" /1.25" barrel combo and the 2" portion keeps it from going all the way in. I also have a 20mm Widescan III 1.25" eyepiece with 84° AFOV that I only use in...