It is a good thing in Voyager, letting it sort out the flat exposure times for itself, shot by shot, I also allow it to shoot anything from 30 seonds to 0.2 seconds. I do have to remember though to have it shoot LRGB flats before NB so that the flats requiring most light per unit of time are done with the brightest sky.
I do rotate my cam from night to night and the rotator is after the flattener so there is added value in session by session flats there.
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