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David Hall is an Electrical Engineer designing electronic circuits for almost 30 years. Most of that time was in the aerospace industry with Boeing/McDonnell-Douglas in St. Louis, MO. Currently, he designs laser electronics for Cutting Edge Optronics, Inc. in St. Charles, MO.
His primary astronomy interests are observing, ccd imaging, and astronomy related software development.
John has a doctorate in Organic Chemistry. He has been a professor, pilot plant manager, plant troubleshooter, and laboratory research chemist in his over 30 years in the chemical industry. He currently works for Tyco-Healthcare in St. Louis, MO.
His primary astronomical interests are observing and photography (ccd and 35 mm).
“The principle of coatings is to reduce the light reflecting on the glass surface. If the coating has a ¼ wavelength thickness and the glass an index of refraction higher than the coating the 2 reflections are in phase opposition and cancel. For 1 multicoated surface, the transmission can increase up to 3.5%”