|
I haven't used an Astronomics Ha filter. I have Baader 7nm and Astrodon 5nm. The Astrodon is quite a bit better but I wonder if I just got a bum Baader. It often gives black specs in the images whereas the Astrodon does not. The Astrodon gets better detail but its not a massive gain.
Ha coatings are apparently hard to do and can be affected by humidity etc. The coatings on my Baader look a tad speckled.
If you image from a dark site the narrower bandwidth the better is the usual formula.
Greg.
|