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I had a Vixen RS200 F4 Newt and I could not collimate it. Then I got one of those cheap laser collimators and collimation was reasonably good within 5 minutes.
You need a good coma corrector. The Vixen one seemed OK for small chipped cameras perhaps up to a DSLR. Baader makes a MPCC coma corrector which is popular.
Perhaps a 3 inch Wynne corrector from Philip Keller may be the go for the 12 inch.
Greg.
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