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I just received my Badder UHC-S filter and was out last night and swung the scope around to Eta Car, which was getting pretty low in the sky and put in the 10mm. I could make out some of cloud formation, but not a lot. I had to point in the general direction of my neighbour who had just turned on his outdoor spotlight, so it wasn't exactly the best time to try to see much. I put the UHC filter on the eyepiece and tried again. The sky went MUCH darker and the whole area became much easier to see, the cloud was plainly obvious now whereas previously, without the filter, you had to concentrate to see anything.
So if you have to view from less than dark sites, a filter may be a good investment to at least allow you to see things you won't be able to see otherwise...not easily at least. I didn't try the OIII, probably should have to see the comparison.
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