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field flattener


'field flattener' can also refer to...

 

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A glass plate or plates, located between the objective and the focal plane of a telescope, optically figured to correct for aberrations such as coma (see Coma, Optical) or curvature of field. On large telescopes, a field corrector is particularly important at the prime focus to give a wide, coma-free field.

Subjects: Astronomy and Astrophysics.


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