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Thanks.
Yes I think greyscale is the best format for a single colour image.
Gee the filter is dark. I guess I should do some visual observing with it too. Unlike the H alpha filter I can at least see nebulosity in the viewfilder, but focussing requires moving the scope to one of the stars in the southern cross as none in Eta Carina are bright enough. I might see if I can do some "mapped colour" images by combining this green O3 image with a H alpha image.
Scott
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