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I used to experiment with a 120mm F5 achro refractor for imaging. If the stars are not too bright in the field you can get away with it. But something like the Orion nebula with bright field stars was horrendous. With OSC anyway. A mono cam and RGB filters help a bit if you refocus between filters, but I noticed the blue channel was still bloated. Maybe with a Semi-Apo filter it would have been better. In narrow band they work fine.
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