Quote:
Originally Posted by dugnsuz
Thanks for the comments and info greg.
Using 10minutes as a rough starting point for my proposed Ha exposures and using Eta as an example, would I be likely to record enough detail with the 6nm and 13nm filters in this time?
Doug
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Hi Doug,
The usual advice on narrowband is to do longer than normal exposures so the signal gets well above the noise.
I have done 10 minute subs and they worked fine. 15-30 minutes may be better from a signal to noise ratio viewpoint.
It becomes more critical with O111 and especially S11 which si very dim.
Ha isn't so bad.
Greg.