@Wladimir_K Actually, the “live composite” mode that I used does exactly what you are suggesting, but in camera. It takes a single base exposure for the scene, and then continually takes subsequent exposures of the same length and merges them in camera. There are several different methods for the merge (this is an Olympus OMD), but the “composite” style I used here only merges new pixels that are brighter than the pixel already in the stack. The problem I got with noise here is that I drastically underexposed the total scene in an effort to get more depth of field. In retrospect, I should have opened my aperture as wide as will go (f2.8 on this lens), and bumped the ISO a little to get my base exposure brighter and perhaps the shutter speed a little faster (2 or 3 seconds I think would have been better). Then the noise would be better since we wouldn’t have to pull the shadows so far up in post.
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