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I live in the outer suburbs of Brisbane and have started using an Astronomic CLS filter for visual. It has made a bit of difference by darkening the back ground sky so the object stands out better. Diffinately improves the contrast but is still no substitute for dark skies. Nothing is but still makes an improvement. This filter is recommended for aperatures 10 inch and up as it will also cut back abit of the "good light". There is another version for smaller aperatures. Orion put out their versions as well and are about half the price and from what I hear work OK as well. Don't expect over the moon results with these types of filters but they are better than nothing for visual. Everything that helps if worthwhile IMHO.
Matt
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