Doubly ionized oxygen

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1Optics / Astronomical filter / Filter / Wratten number / Neutral density filter / Doubly ionized oxygen / Photographic filter / H-alpha / Electronic filter / Optical filters / Observational astronomy / Technology

The Use of Astronomical Filters One of the puzzles of visual astronomy that many beginning amateur astronomers get caught up in is the use of filters. Which ones to purchase, and which ones are useful for what types of observing are the most

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Source URL: sas-sky.org

Language: English - Date: 2012-04-06 13:03:58
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