Extender optical system
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United States of America Patent
Stats
-
Nov 2, 2004
Grant Date -
Aug 14, 2003
app pub date -
Jan 28, 2003
filing date -
Feb 7, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An extender optical system, for insertion between a photographic main lens and a camera body for changing the focal length of the lens system as a whole to the long focus side, is formed of, in order from the object side, a first lens group having negative refractive power, a second lens group formed of a single negative lens, and a third lens group having positive refractive power. The negative lens that constitutes the second lens group is made to move in directions that are normal to the optical axis so as to correct for what would otherwise be blurred images due to vibrations. Various conditions are preferably satisfied so as to ensure high image quality over the entire field of view.
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Cited Art Landscape
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