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I like the CLS for visual as well as imaging. You can have a lot of fun comparing the view the UHC and the CLS give of mission nebulae. For instance, for me the UHC really brings out the dark lanes in the Trifid, but kills off all the reflection nebulosity (the blue stuff in images) whereas the CLS preserves some of it and brings it out from the background.
The graphs suggest that the CLS would be a good bet for galaxies, particularly with your 18" :-)
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