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Just an observation I made at Ballarat at the weekend regarding UHC filters. If I use one at home in the 'burbs, it really makes a difference to Eta Car and the Tarantulla and makes it stand out. However, I tried it at the camp and it appeared to make the image worse. I gather this is because at home, it drops out the sky glow from all the lighting, improving the contrast a lot. If you don't have much light pollution, there isn't much to "drop out" and so you just notice the drop in light from the nebula in general. Of course, the view was much better even with it compared to home. If you do most of your observing from a city, they will make a huge difference and are worth it.
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