Hey everyone- so 6 months or so ago, I snagged an old Tasco 152x Refractor, 60mm x 900mm f/15. We believe its provenance is early royal astro from the late 1950s.
ANYWAY, so I finally have it with me out in southern Utah, dark sky, ~5500ft. Last night I was looking at the comet, and trying my first tries looking at various stars, planets, etc. with it.
Basically, I feel like something is "messed up" with it (with the objective). I really couldn't get much practical magnifaction more than about 100x out of it before everything was super-soft and fuzzed out. I believe the type of errors are "Coma"-esque, as everything was kind of fuzzy and had ghosting/skewage to one side. If i had something perfectly in the middle it would get better, but still tended to be skewed.
I know that someone has "messed" with the objective before- it has at least one small clam chip in the edge. (Not sure if the inner or outer lens). But to me I think that would only happen from someone trying to clean it or something...?
Anyway, so where is the best place to start in terms of troubleshooting this? I am up for dissecting the lens as as it stands I don't think its in good working order.
Course I didn't check it without a diagonal in place- maybe it is related to that? Can a diagonal introduce a coma-like effect?
Any thoughts are appreciated, I can check this out over the next week or so weather dependent.
Thanks in advance!!!