I’ve got 860mm in my Esprit 120ED, it doesn’t come close to cutting it… The only problem I have with 1630mm is it’s f/8, so it’s slow. I’m on a mountain so the seeing can be pretty good.
agreed.
my Stellarvue SVX-102T is 714mm. it does not come close to my RC which is 1485mm reduced.
could you drop the F Ratio slightly by spacing the reducer. ?
I got mine down to F5.9 (by spacing) which is much better than F8, but still slower than my Takahashi FSQ.