A slow-motion crosshair drive for long-exposure photography of fast-moving objects

Details A slow-motion crosshair drive for long-exposure photography of fast-moving objects A slow-motion crosshair drive for long-exposure photography of fast-moving objects

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jbaa...97...90t&link_type=abstract

Journal of the British Astronomical Association, vol.97, no.2, p.90-95

Astronomy and Astrophysics

Astronomy

Scientific paper

This paper describes the design and construction of an electronic guiding system suitable for long-exposure photography of fast-moving objects such as comets and Apollo asteroids. The custom-designed circuitry drives the crosshair in a filar micrometer at a rate equal to that of the object being photographed, but in the opposite direction. As the observer keeps the crosshair centred on a guide star, the telescope thus follows the moving object.

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