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Hi Glob
I think that Par focal is more a property of a range of eyepieces, meaning that when one eyepiece is focused, you can simply replace it with the next one and in theory, the focus should be spot on.
From memory, I don’t think that my TeleVue x2.5 and x5 PowerMates (1 ¼ inch) are parfocal – I recollect having to adjust the focuser when changing PowerMates with either a ToUcam or a DMK CCD camera plugged in.
I have a TeleVue x5 PowerMate in the 1 ¼ inch fitting and in my experience, I have only used it visually on my Vixen 102mm F9 ED refractor a few times, mainly to split double stars.
A x5 PowerMate will convert your 80mm F5 to an 80mm F25 system and you will probably be disappointed with the views?
Cheers
Dennis
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