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Finally got a clear night in Adelaide last night ... at least for a little while!
Was a couple of mm out of focus only, and flats taken when in focus are exactly the same as that previous one, i.e. about 10% darker in the middle. Seems even to happen without the reducer in place.
No big deal, as the lights seem to have the same profile and so the flats calibrate them ok. Just seems curious.
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