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Top effort Chris,
Some great detail and well put together.
Regarding the dimming. When imaging over such long periods the histogram is you best friend. It will drop off before you have detected any high altitude cloud that may not even be perceptible to the eye.
If the situation arises where the live image dims during a capture you can compensate by adjusting gain or exposure on the run, however for continuity over a long period, keeping an eagle eye on the histogram is the go.
Again, very well done.
Regards
Trevor
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