I am trying to find info from actual owners (I know not many out there) about the new Takahashi FSQ-80FC. Specifically, can the stock focuser be removed and replaced with something else (PrimaLuceLabs, Moonlight, etc.). It is not clear from the info out there (and even asking folks at NEAF yesterday) if there is a lens element in the focuser drawtube or not.
FSQ-80FC stock focuser replacement compatibility question
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External focuser on an SCT; What about temperature change induced focal shift and back-focus?
It seems like every serious astro-photographer is putting external focusers on the back of the EdgeHD telescopes and locking the mirrors. I picked up a nice little EdgeHD 8" and a Primaluce Lab Esatto 2" LP focuser and gave it a try myself....
External focuser replacement on telescopes; directly addresses focuser upgrade compatibility questions.