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I found from testing with my 400D that signal to noise ratio will be maximised at ISO1600, with the sub exposure time then chosen based on the temperature (see attached, which shows the SNR of different settings all relative to ISO800 / 5 mins @ 20C). I then take LOTS and LOTS of subs (I now aim for at least 100+ subs). Suggest that you dither between subs as well if you can.
Last edited by rmuhlack; 03-02-2014 at 08:31 AM.
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