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DSO's at F/10 with a 200mm SCT and 294MC Pro
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28-06-2021, 04:54 PM
AdamJL
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Join Date: Sep 2010
Posts: 2,100
Hi Lance. I can’t speak for reflectors for but for refractors, back focus is a requirement with or without a reducer.
At least I’m my (limited) experience, if you’re off by a mm, it will have a big impact on the final image
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