The true field of an eyepiece

Details The true field of an eyepiece The true field of an eyepiece

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jbaa..105..242g&link_type=abstract

Journal of the British Astronomical Association, vol.105, no.5, p.242-245

Physics

Optics

Instrumentation, Optics

Scientific paper

The true field of view of an eyepiece is found by dividing the apparent field of view by the angular magnification. As the angular magnification is not readily determined, an approximation to the angular magnification, found by dividing the focal length of the objective by the focal length of the eyepiece, is used instead. This approximation, which the author proposes to call the linear magnification, proves satisfactory for eyepieces with moderate apparent fields, but is unsatisfactory for the wide angle eyepieces that have become readily available in recent years. Consequently a more suitable equation for calculating the true field of an eyepiece needs to be found, based on the generally used linear magnification.

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