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Hi all,
I am a bit late to this thread.
If you only plan to buy 1 filter for DSO work, the UHC is the best one to get. The OIII and UHC assist to a similar degree on a lot of targets, but there are some targets where one filter will work better than the other. The UHC offers "some" improvement on a larger number of targets than the OIII. In addition the UHC does not dim the background field stars quite as much as the OIII. Owning a 12" scope, if its within your budget you will get some benefit owning both a UHC and an OIII filter, but you will use the UHC more often. In smaller scopes (less than 8" aperture) the UHC will see a lot more use than the OIII. I own both the Astronomiks UHC and OIII as well as the DGM Optics Narrow Pass Band (NPB). The Astronomiks filters are the best available IMO. The DGM is the best value for money.
CS-John B
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