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Last night I was involved in a public viewing (about 250 people) in Montrose, an outer suburb of Melbourne. I chose the Swan Nebula to focus on, it appeared much better than at home and decided to put in the OIII filter. The sky darkened considerably (almost jet black), so did the Swan, and the contrast improved markedly. Unfortunately, because of the target audience of "non astronomical" people and about 50% kids 12 and under, I took the filter out otherwise they may not have the patience to study the image and allow the eye to pick out the improved detail. I have not used it much previously, but it definately made a big difference. I will have to try it more often at home. I think the UHC filter may reduce the overall brightness a bit less though as I believe it passes OIII and H-beta? Which means more light will get through in total.
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