Originally Posted by gregbradley
For what its worth my Astrodon 5nm S11 filter does not pass on much either. It seems S11 is generally the weakest of the 3 NB filters by a long way.
Indeed there isn't much there!
But having seen data from identical scopes with differing SII filters and having used 1.25" SII from CS, I'm suspecting all animals are not equal