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I will have to look at it, and make sure it has the latest (Final) firmware on it. A lot of the time Canon seem to give their own names to common functions so I must have missed it.
I have to have another go anyway given that I just worked out that the camera was by default stopping itself down to F7.1 instead of F3.5. I can stay with a 20 second exposure with NR turned on assuming the firmware on it supports it, if not, I will update to the final one) and get a lot more data with a frame rate still around once every 45 seconds. I might even be able to cut it to 15 seconds exposure with 15 seconds dark frame time, a few seconds processing internally and download and get 40 seconds per exposure overall or a bit less.
Next weekend, unless I get home and the forecast for the night looks worth having a go at.
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