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Hi John,
Currently I go with 58 sec's per channel at 84 fps. My final RGB consists of RRRR, GGGG, BBBB. I only have a manual filter wheel so between my four R & four G channels I lose the time it takes to rotate from R to G and then from G to B, 20 secs all up. That gives an elapsed time from the start of the first R to the end of the fourth B of approx 12 min's. I generally go with stacking 50% of my data although I have had instances in exceptional seeing where I have stacked up to 90% of the data.
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