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Thanks Colin and Michael. I had big plans for a late season portrait of the Flame and M42, which just fits the sensor diagonal. But alas, cloud.
Michael. With reducer 255mm plus the 1.6 sensor crop factor, 408mm equivalent field of view.
For anyone interested, here's a bias only, no dark calibration version. I think it looks a whole lot better in the background.
In this case.
Signal = (light - bias)/(flat - bias) for a cooled DSLR.
The PI pixel rejection map tells the story.
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