Quote:
Originally Posted by strongmanmike
If you wish to image galaxies or anything dusty ie reflection nebulae and image them in colour....you will certainly need RGB filters, as both are essentially invisible in NB filters. Star clusters, both open and globular, also look a lot better in RGB too  . If however you are happy to be restricted to imaging emission nebulae only, then yes, you can do this with narrowband emission line filters alone.
Mike |
It should be pointed out that some galaxies have very strong emissions, the Hamburger being one, and are certainly not invisible in NB. There are no absolutes in regard to imaging. NB accents are easily captured in M83 and enhance the appearance imho. The Helix Nebula looks great in both RGB and NB.