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Good to see that you are pleased with your UHC filter. They are certainly useful for getting extra features out of nebula, and indispensible when you turn your attention to the tiny planetary nebulas.
I tend to use my Ultrablock UHC more than my other filters, but I'm also still quite fond of the various broadband filters like the Lumicon Deep Sky and Orion Skyglow, especially with very low power eyepieces. The O111 only gets pulled out when the UHC occasionally can't get a planetary nebula to show up.
There is one other use for your filter which you may not have thought about. If it's 1.25" you may be able to fit it inside a binocular with a big eyecup and long eyerelief, and hold it it with a bit of Blutak. If it's a 2" filter, you may be able to tape to the plastic/rubber/metal in front of one of the objective lenses.
After lots of experimentation, I found I much preferred to have one filter in binoculars and to superimpose the filtered and unfiltered images, than having two filters, with one over each tube. It's fun seeing Eta Carina with extra pop in your binoculars.
Regards,
Renato
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