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1.25" Oxygen III Line band filter
$99.95This Celestron Oxygen III light pollution filter has a very narrow passband for very high contrast on emission nebulas, making it a good choice for city and suburban observing . . . -
48mm Oxygen III line band filter for 2" eyepieces
$139.95This 2" Celestron Oxygen III light pollution filter has a very narrow passband that blocks out almost all unwanted light pollution, making it a good choice for nebula observing from city and suburban locations . . .