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I am currently using Astronomik UHC and OIII filters and am very happy with them. For deep sky visual work a good UHC and OII really are the only ones you will need IMHO. You can get more exotic one (H-beta for example) but they have limited uses.
There are more broadband light pollution filters around, but I have never found them as useful, but in a bad light pollution area they may be worthwhile.
Avoid the filter sets, unless you are doing a lot of planetary work, really not much help.
Malcolm
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