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Weird?????
Are you using an internal or external intervalometer? If it's internal, it may not be coping with the transition to long exposures.
I'd like to hear from the experts as to how they transition from day to night. Do they pick an arbitrary point in the evening (e.g. after astronomical twilight ends) when they shift to manual exposures of 20sec and maximum aperture, and the smooth out the transition using software?
DT
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