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coma corrector increases focal lenght? - by: pauledd

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Hi there
I recently bought an coma corrector for my f5 (200/1000) Newton. It is said it has an reduction factor 0,95. Doesnt this mean it reduces my telesope focal lenght by .95 from 1000mm to 950mm? But when I attach the corrector to the scope and take an image ekos complains after solving the alignment about a wrong focal lenght and I should correct it to 1141.79mm :huh: .

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