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a line filter for only the two oxygen emission lines
8 or higher
In those ranges
The operation couldn't be simpler
Explore Scientific 68° 20mm Argon-Purged Waterproof Eyepiece
Astrozap 11" Sct Dew Shield Cap Dew Heaters a line filter for onlyAstrozap dew shield caps are made to fit the Astrozap line of aluminum dew shields. Do you own a permanently mounted telescope in an observatory? Tired of having to take the dew shield off at the end of a session, losing your perfectly balanced scope, just to put the telescope cap back on? Protect your optics from dust and bugs. Astrozap standard dew shield caps are made from 18 gauge aluminum and powder coated texture black.