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Thanks all.
Actually I wonder how much star bloat not using a filter might cause, as I was shooting some test shots through my 50mm F1.8 lens with no IR filter, and the stars looked hardly any worse than normal (always get some comatic stars near edges at F1.8 anyway). There might be some IR fogging thay may be reduced a bit by using a filter, hard to say.
My shots were taken with my 10 inch F5.6 scope, with baader coma corrector.
Scott
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