I just dug out my 40 year old Tasco 80mm F15 refractor for some solar and lunar observing. Not sure why. Think I might be going senile in my middle age.
Oh yeah that's what it was, I want prime focus to fit in the field of the APSC sensor without a barlow and for the Sun and Moon I don't need aperture. But man, I forgot how loooong this thing is.