Hi Joe,
Quote:
Originally Posted by EpickCrom
Hi Glenn, I'm thinking of buying a UHC and a OIII filter. From what I've read they are the best filters for deep sky observing.
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My advice FWIW for 10" of aperture is to get the UHC filter. The OIII is a "line" filter and passes only the lines made by doubly ionised Oxygen. The UHC also passes the H-Beta line too.
The nett result for a 10" is that with the OIII, is the sky/field becomes I think unnaturally dark. For better brightness of the object of interest itself, the UHC works better for a large majority of nebulae.
Goes without saying (I hope) that both UHC and OIII filters are a hindrance on any deep sky objects other than planetary and emission nebulae. Will considerably dim things like galaxies, clusters etc. The only "filter" that works on those sort of objects is a genuinely dark sky.
Best,
L.