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Field Derotator for Astrophotography (Part 1)

An Introduction to Field Derotation Altitude-azimuth (alt-az) telescopes cannot be used for long exposure astrophotography. To overcome this flaw in alt-az-mounted telescopes, Cheng-Yang designed and built a field derotator that removes this degree of freedom and enables alt-az telescopes to become astrophotography platforms. Most telescopes used by amateurs for astrophotography are equatorially mounted. However, the […]
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