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what filter for galaxies/nebula


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Good question! I suppose the easiest way is to see what other people have done ;) But if you want to be technical there are catalogues of emission (and other) nebulae online eg Sharpless and NGC (New General Catalog) . Stellarium's display is quite good for indicating HII regions (user selectable object types). Of course many HII nebulae are well known eg the North America Nebula. I don't know what CdC tells you.



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