Quote:
Originally Posted by torana68
8" f8 still usable on a GEM unless your a bit on the shorter side
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Has anyone actually seen an 8" F8 newton in a shop recently. since photography became the focus for future use F5 or even 4 has become sort of a standard.
other point is mounting issues, balancing and wind load. if you´re alone at night and try mounting a big, long tube on a gem - can be tricky (though I´ve seen guys here mounting 12" newtons on an EQ6!) and the longer tubes introduce more vibration issues (esp with wind)- every touch of the focuser lets the image shake in your eyepiece for a while.