kathryn barger

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Astrophotography filters: How narrow is too narrow

For many years now I have been promoting the idea that for emission nebulae, whether you have light pollution (LP) or not, the narrower your filter’s pass bands are, the better. Time and again my test results have demonstrated this relationship to be true; that object contrast and signal-to-noise-ratio (SNR) increase as the pass band width decreases. Recently howe...

Light pollution decreased in LA county thanks to Kathryn Barger

Rod L. Kaufman, the chair of the light pollution committee for the Los Angeles Astronomical Association, recently awarded a plaque of appreciation to county Supervisor Kathryn Barger at the Mount Wilson Observatory. This recognition was for her contributions to reducing light pollution in the Santa Clarita Valley. Light pollution decreased, and Kathryn Barger recogni...