Hello, would an Ha 6nm filter be good for the type of camera I have, for moderately light polluted sky? I have a regular LBP but I am thinking about a neb type filter. The one I found used is Astronomic and only $135 but the Triad filter is so much more expensive. But is a Ha filter like 1 /3 as effective as a triad, since that is a singe versus tri-band? Maybe compared to a triad a single band is useless?