Quote:
Originally Posted by Slawomir
I also use 9 points and 2x2 binning, but focus on each NB filter instead of using offsets. Exposures are longish - 15s, so the process takes a few minutes, but I do not refocus often, so it does not bother me. One day will certainly look at calculating filter offsets.
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If you want to calculate filter offsets, get trial version of FocusMax 4 and CCDAP or ACP.