I have been continuing my ETTR, silent DNG timelapses, and have a suggestion/idea.
As is recommend in the first post, ETTR needs greater than 10 seconds or so to 'kick in'.
My results today confirm that a 10 second interval is marginal, ie I got strange results and frames with 1/8000 shutter, when the base shutter was about 1/250. Going to a 15 second interval stopped the frame 'dropping', but I still had a step in exposure about halfway through a 300 image capture.
I really only need ETTR for sunrises and sunsets, as at other times exposure, front to end, doesn't change that much, and is recoverable through LR/LRT.
I will wait for an EXIF enabled silent DNG before attempting a holy grail sequence, however, my thought is this. In the timelapse area, rather than only be able to ETTR every frame, how about an ability to carry out an ETTR every nth frame. Thus over a 60 min sunset sequence, you would, say, enable an ETTR 'reset' every n images.
Also the timelapse would only start AFTER the ETTR had reached a solution, ie the timelapse could tolerate the extra delay between the ETTR frames. This approach would also allow any timelapse interval, ie less than the ETTR solution time.
To LRT these steps will clearly trigger the auto key framer.
Bottom line: I wonder if an extra user variable of carrying out an ETTR every nth frame, and allowing for an ETTR solution, would be a useful addition?
