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UHC -- No Nooooo ......
Hi Chris,
No, No, No! Nebula filters are not for galaxies, they're for ... well nebulae. They will give a considerable contrast boost to most emission nebulae and nearly all PNe because they shine by the emission lines that the filter passes. But won't help a galaxy -- in fact it will get dimmer because galaxies are mainly made of stars and a UHC will block a lot of starlight. Use the filter, even on a bright galaxy and it will get even harder to find (probably invisible actually).
Hang on to that filter for things like M42, or Eta Carinae (NGC 3372), but keep it firmly in the eyepiece box for any galaxy!
Best,
Les D
Last edited by ngcles; 13-03-2008 at 02:30 PM.
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