Cleaning up the Light: Astroimaging and sodium lights

Cleaning up the Light: Astroimaging and sodium lights

Yesterday I spent the day at the MidAmerican Regional Astrophysics Conference. This year this roaming astronomy meeting was held just outside St Louis at St Charles Community College. I have to say I was really impressed with the quality of the presentations and the staff took care of me extraordinarily well. One of the ones that particularly caught my attention was on the use of didymium filters to minimize the effects of sodium light on astroimages. Here are some examples: Before After In this presentation by Doug Kniffen, I learned that these photographic “enhancement” filters are fairly effective at blocking light the color emitted by sodium (and thus emitted in sodium lights). While not designed for telescopes, when employed for off label uses,...

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