Oops. Yes STC filter. This is the best comparison I have of using the Duo filter, on the Tarantula.
First is 2.7 hours of 90sec lights with UV/IR filter.
Second is 2.8 hours of 6min lights with STC Duo narrow band-filter.
Ignore the difference in resolution - as the first image is binned 2x2, the second isn't.
Edit: the first shot is at f5.9 and the second with the duo is f5.0.
Last edited by ChrisV; 05-03-2019 at 08:09 AM.
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