Barlow Lens

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4711.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4711. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Instrumentation And Observational Techniques, Astronomical Instrumentation

Scientific paper

An additional lens that increases the effective focal length and magnification of a telescope. It is a negative diverging lens (either concave on both sides or, more usually, `plano-concave'—flat on one side and concave on the other) that is placed in the converging cone of light a short distance in front of the focal plane of the objective or primary mirror. By decreasing the angle at which the ...

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