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astrograph


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A telescope specifically designed for photographing comparatively wide areas of sky. Traditionally, an astrograph is a refractor with a lens corrected to give its best images at blue wavelengths, to which early photographic emulsions were sensitive. The astrograph is mounted together with a visual refractor of similar focal length for accurate tracking on a guide star. Today, Schmidt cameras are used instead, typically having fields of view of 6°. See also Normal Astrograph.

Subjects: Astronomy and Astrophysics.


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