Brand new, unused, still boxed.
Google tells me backfocus on this corrector is between 65 and 85mm. Comes with an adapter for a 2" nose and the lens top thread is 48mm so it can also screw directly to a 2" nosepiece like a 2" filter.
I've never used this so can't comment on performance but here's a quote from Andrews.
Quote:
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Originally Posted by Andrews Comm
COMA CORRECTOR (CO-001) just arrived! Proven ideal for 8", 10" and 12" Newtonians. Coma corrects SCTs well and improves their field of view, too! Customers report very impressive results. Notably improves visual performance of GSO RC telescopes, too. Not for refractors.
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$100 posted.
