Title:
TELEPHOTO LENS
Document Type and Number:
Japanese Patent JP3476909
Kind Code:
B2
Abstract:
PURPOSE: To provide the large aperture telephoto lens which enables photography from infinite distance to a point about -1/2 magnification by arranging a movable lens group in a lens system which is subordinate to a main lens system and bearing magnification operation and aberration compensating operation.
CONSTITUTION: The whole optical system is composed of a 1st lens group G1 with positive refracting power, a 2nd lens group G2 with negative refracting power, a 3rd lens group G3 with positive refracting power, and a 4th lens group G4 with negative refracting power, and focusing from an infinite-distance body to a finite-distance body is performed by moving partial lens components G21, G22, G41, or G42 in the 2nd lens group G2 and 4th lens group G4 so that the on-axis interval to the 3rd lens group G3 is shortened while the 1st lens group G1 and 3rd lens group G4 are fixed about an image plane on the basis of the positions of the respective lens groups about the infinite-distance body.
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Inventors:
Takanori Yamanashi
Yuko Kobayashi
Yuko Kobayashi
Application Number:
JP13323194A
Publication Date:
December 10, 2003
Filing Date:
June 15, 1994
Export Citation:
Assignee:
Olympus Corporation
International Classes:
G02B13/02; G02B9/64; (IPC1-7): G02B13/02; G02B9/64
Domestic Patent References:
| JP5875107A | ||||
| JP5882217A | ||||
| JP6151117A | ||||
| JP53134425A | ||||
| JP5470827A | ||||
| JP6169016A |
Attorney, Agent or Firm:
Hiroshi Nirazawa (7 outside)
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