Quote:
Originally Posted by LewisM
Taking all this on board.... and now I am deciding on a Televue 101...  quad-apo should be decent I assume
So, narrowing this dow - TV 101 quadruplet, Vixen FL102 doublet or a Northgroup 127 Triplet.
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The TV NP101 is easily the best of the three you are now considering, whether it be for astrohotography or visual. As Greg says it is a 4 element Petzval design and very similar in design to the FSQ106.
I would have thought a 2nd hand one of those would be notably more expensive than the Vixen FL102S or the Chinese 127ED.
Cheers,
John B