Optical: systems and elements – Compound lens system – Telescope
Patent
1994-02-17
1997-11-11
Dzierzynski, Paul M.
Optical: systems and elements
Compound lens system
Telescope
359432, 359753, 359676, 359683, 359686, 359423, 354219, 354225, G02B 2702, G02B 1304, G02B 1514, G02B 2300
Patent
active
056870230
ABSTRACT:
A Keplerian zoom finder optical system comprises an objective lens group having a positive refracting power on the whole and constructed of, in order from an object side, a first lens unit having a negative refracting power, a second lens unit having a positive refracting power, a third lens unit having a negative refracting power and a fourth lens unit having a positive refracting power. This finder also comprises a regulating element, disposed in the vicinity of a focal position of the objective lens group, for regulating a visual field. The finder further comprises an eyepiece unit having a positive refracting power. The finder varies a magnification by moving at least the second lens unit along an optical axis and satisfies the following condition:
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Dzierzynski Paul M.
Nikon Corporation
Sikd-er Mohammad Y.
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