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Sure you could dither between each L,R,G,B frame, but you're going to be stacking all the L's, R's, etc so not any point dithering on every filter change - better to do it so that each LRGB is dithered relative to last, if that makes sense? Saves having to wait for guiding to settle for 3 lots of dithering, which on a cheapish chinese mount is often around 15-20secs, if that makes sense?
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