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Hi Again Matt,
The UHC filter will help a lot in better defining many of the Emission Nebulae, it works particularly well with the Key Hole Neb. Although I don't have a UHC filter I do have both 1 1/4" and 2" Astronomik OIII filters and the difference with The Keyhole is immense, it about doubles the size of the Nebula, it makes it so large that even my 31mm Nagler doesn't fit the object in the field of view, which in a F 4.5 system is considerable. You would probably get more general use out of a UHC filter than an OIII. The OIII works particularly well with Planetary Nebulae and Supernovae Remnants. However you would probably get more use from a UHC filter.
As a UHC filter will effectively increase the apparent size of many nebulous objects and considering the long FL of your C8 I would think that you would really want a wide field long FL eyepiece to appreciate the effects of the filter.
Regards
Trevor
Regards
Trevor
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