JPS6468709A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS6468709A JPS6468709A JP62226185A JP22618587A JPS6468709A JP S6468709 A JPS6468709 A JP S6468709A JP 62226185 A JP62226185 A JP 62226185A JP 22618587 A JP22618587 A JP 22618587A JP S6468709 A JPS6468709 A JP S6468709A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- refractive index
- negative
- positive
- constitution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Lenses (AREA)
Abstract
PURPOSE:To perform excellent aberration compensation with simple constitution having a large zoom ratio by specifying the refractive index of a negative lens with the least refractive index constituting a 2nd lens group. CONSTITUTION:When the zoom lens of positive, negative, positive, and positive four-group constitution is put in zooming operation from the wide-angle end to the telephoto end, 1st and 3rd lens groups G1 and G3 are fixed and the 2nd and 4th lens groups G2 and G4 are moved relatively along the optical axis to vary the power. At the time of focusing, the 4th lens group is moved along the optical axis to perform the focusing. Then the refractive index of the negative lens with the least refractive index among the negative lenses constituting the 2nd lens group G2 is denoted as nmin and nmin<1.65 holds. Consequently, the excellent aberration compensation is performed with the simple constitution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62226185A JP2526923B2 (en) | 1987-09-09 | 1987-09-09 | Zoom lenses |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62226185A JP2526923B2 (en) | 1987-09-09 | 1987-09-09 | Zoom lenses |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6468709A true JPS6468709A (en) | 1989-03-14 |
JP2526923B2 JP2526923B2 (en) | 1996-08-21 |
Family
ID=16841221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62226185A Expired - Lifetime JP2526923B2 (en) | 1987-09-09 | 1987-09-09 | Zoom lenses |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2526923B2 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01153802A (en) * | 1987-06-30 | 1989-06-16 | Hitachi Constr Mach Co Ltd | Hydraulic driving device |
JPH0328814A (en) * | 1989-06-26 | 1991-02-07 | Matsushita Electric Ind Co Ltd | Zoom lens |
JPH0333710A (en) * | 1989-06-29 | 1991-02-14 | Matsushita Electric Ind Co Ltd | Aspherical zoom lens |
JPH03215810A (en) * | 1990-01-20 | 1991-09-20 | Canon Inc | Rear focus type zoom lens |
JPH0413109A (en) * | 1990-05-07 | 1992-01-17 | Konica Corp | Compact zoom lens |
JPH0413110A (en) * | 1990-05-07 | 1992-01-17 | Konica Corp | Compact zoom lens |
JPH04102815A (en) * | 1990-08-21 | 1992-04-03 | Canon Inc | Zoom lens |
US5301064A (en) * | 1990-04-06 | 1994-04-05 | Hitachi, Ltd. | Rear focusing type zoom lens system |
US5353157A (en) * | 1990-08-21 | 1994-10-04 | Canon Kabushiki Kaisha | Rear focusing zoom lens |
US5359457A (en) * | 1991-10-03 | 1994-10-25 | Minolta Camera Co., Ltd. | Wide-angle zoom lens system |
JPH07113955A (en) * | 1993-10-18 | 1995-05-02 | Minolta Co Ltd | Zoom lens |
US6392817B1 (en) | 1999-07-26 | 2002-05-21 | Canon Kabushiki Kaisha | Rear focus type zoom lens and optical apparatus using the same |
JP2006267862A (en) * | 2005-03-25 | 2006-10-05 | Fujinon Corp | Zoom lens |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61133916A (en) * | 1984-12-03 | 1986-06-21 | Minolta Camera Co Ltd | Telephone zoom lens |
JPS6224213A (en) * | 1985-07-25 | 1987-02-02 | Canon Inc | Zoom lens |
JPS6381313A (en) * | 1986-09-25 | 1988-04-12 | Canon Inc | Zoom lens |
-
1987
- 1987-09-09 JP JP62226185A patent/JP2526923B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61133916A (en) * | 1984-12-03 | 1986-06-21 | Minolta Camera Co Ltd | Telephone zoom lens |
JPS6224213A (en) * | 1985-07-25 | 1987-02-02 | Canon Inc | Zoom lens |
JPS6381313A (en) * | 1986-09-25 | 1988-04-12 | Canon Inc | Zoom lens |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01153802A (en) * | 1987-06-30 | 1989-06-16 | Hitachi Constr Mach Co Ltd | Hydraulic driving device |
JPH0328814A (en) * | 1989-06-26 | 1991-02-07 | Matsushita Electric Ind Co Ltd | Zoom lens |
JPH0333710A (en) * | 1989-06-29 | 1991-02-14 | Matsushita Electric Ind Co Ltd | Aspherical zoom lens |
JPH03215810A (en) * | 1990-01-20 | 1991-09-20 | Canon Inc | Rear focus type zoom lens |
US5301064A (en) * | 1990-04-06 | 1994-04-05 | Hitachi, Ltd. | Rear focusing type zoom lens system |
JPH0413109A (en) * | 1990-05-07 | 1992-01-17 | Konica Corp | Compact zoom lens |
JPH0413110A (en) * | 1990-05-07 | 1992-01-17 | Konica Corp | Compact zoom lens |
JPH04102815A (en) * | 1990-08-21 | 1992-04-03 | Canon Inc | Zoom lens |
US5353157A (en) * | 1990-08-21 | 1994-10-04 | Canon Kabushiki Kaisha | Rear focusing zoom lens |
US5359457A (en) * | 1991-10-03 | 1994-10-25 | Minolta Camera Co., Ltd. | Wide-angle zoom lens system |
JPH07113955A (en) * | 1993-10-18 | 1995-05-02 | Minolta Co Ltd | Zoom lens |
US6392817B1 (en) | 1999-07-26 | 2002-05-21 | Canon Kabushiki Kaisha | Rear focus type zoom lens and optical apparatus using the same |
JP2006267862A (en) * | 2005-03-25 | 2006-10-05 | Fujinon Corp | Zoom lens |
Also Published As
Publication number | Publication date |
---|---|
JP2526923B2 (en) | 1996-08-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080614 Year of fee payment: 12 |