I have my name down for a current production C90, to ride on a Manfrotto 502AH head & 028B tripod. I’m now wondering whether I should instead get in line for for the C5 spotter. The Manfrotto combination would take either one easily, and I’d get more light with the C5 than the C90, but is that enough? How well does the C5 stack up against the C90? Just as sharp (I’ve have had four Synata 90MM Maks, and three were winners)? I had a C6 a few years ago that wasn’t the best, and it frequently lost collimation. Either scope would be primarily planetary, Lunar, and Solar. I believe the C5 has special coatings while the C90 does not. Lastly, the C90 is affordable & pretty justifiable price-wise. The C5 is a big stretch. Is the steep price tag because it is marketed as a spotter?