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Performance is very good. High contrast sharp images with very low amounts of false colour. The above link to the Cloudy Nights build thread has an observing report at the end that describes a comparison with a 6" f15 achromat stopped down to 5" f18.3. The observing conditions at the time were not ideal. I am away from home now for a few weeks but will try more observing tests and comparisons when time permits.
Andy
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