Focal Ratio

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4793.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4793. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Instrumentation And Observational Techniques, Astronomical Instrumentation

Scientific paper

The ratio of the focal length of a lens or mirror to its aperture. For a
lens or mirror of focal length, F, and aperture, D, the focal ratio, f,
is given by f=F/D. For example, a lens of 10 m focal length and 2 m
aperture would have a focal ratio of 10/2=5; this would be written as
`f:5'....

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