JPS5595922A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS5595922A JPS5595922A JP254579A JP254579A JPS5595922A JP S5595922 A JPS5595922 A JP S5595922A JP 254579 A JP254579 A JP 254579A JP 254579 A JP254579 A JP 254579A JP S5595922 A JPS5595922 A JP S5595922A
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- wide angle
- variable power
- positive
- 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 obtain a high variable power rate at a wide angle of view without increasing diameter by providing five lens groups having positive, negative, negative, positive and positive refracting powers subsequently from the object side and letting these satisfy the specified conditions.
CONSTITUTION: The entire system consists of five lens groups of the 1stW5th groups. The 1st group is stationary during zooming but moves during focusing. The 2nd group moves linearly to perform variable power action during zooming and the correction of the focus movement on account of this is accomplished by the movement of the 3rd group. The 4th group is stationary and an afocal system is constituted by the 1st thru 4th group. The 5th group has action to form image on the fixed image plane position. Respective conditions shown by formula (1)W(10) are satisfied by this lens systems. This suppresses the increase in the front lens diameter and the shape of the maximum iris diameter and provides the zoom lens of a wide angle of view, large aperture ratio and high variable power. (Va is the geometric mean of the afocal angular magnification of the wide angle end and telescope end, F is the focal length of each group, f is the focal length of each lens and d is the thickness and air spacing of the lenses.)
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP254579A JPS5595922A (en) | 1979-01-12 | 1979-01-12 | Zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP254579A JPS5595922A (en) | 1979-01-12 | 1979-01-12 | Zoom lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5595922A true JPS5595922A (en) | 1980-07-21 |
JPS6131848B2 JPS6131848B2 (en) | 1986-07-23 |
Family
ID=11532344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP254579A Granted JPS5595922A (en) | 1979-01-12 | 1979-01-12 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5595922A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58108511A (en) * | 1981-12-22 | 1983-06-28 | Asahi Optical Co Ltd | Light zoom lens |
US4491395A (en) * | 1981-02-16 | 1985-01-01 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
-
1979
- 1979-01-12 JP JP254579A patent/JPS5595922A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4491395A (en) * | 1981-02-16 | 1985-01-01 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
JPS58108511A (en) * | 1981-12-22 | 1983-06-28 | Asahi Optical Co Ltd | Light zoom lens |
JPS6229769B2 (en) * | 1981-12-22 | 1987-06-29 | Asahi Optical Co Ltd |
Also Published As
Publication number | Publication date |
---|---|
JPS6131848B2 (en) | 1986-07-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2014106391A5 (en) | ||
JPS575012A (en) | Four component zoom lens system | |
JPS54127322A (en) | Zoom lens | |
JPS5621112A (en) | Focusing system of zoom lens | |
JPS561009A (en) | Zoom lens | |
JPS5535323A (en) | Super wide-angle zoom lens | |
JPS5741608A (en) | Lens for closeup photographing | |
JPS5648607A (en) | Wide-angle zoom lens | |
JPH0437963B2 (en) | ||
JPS5767908A (en) | Wide-angle zoom lens | |
JPS57161824A (en) | Zoom lens system | |
JPS55130510A (en) | Afocal barrel lens | |
JPS55163511A (en) | 2-group constitution zoom lens | |
JPS5595922A (en) | Zoom lens | |
JPS58137814A (en) | Focusing system of 3-group zoom lens | |
JPS5651709A (en) | Reverse telephoto type wide angle lens | |
JPS5576318A (en) | Zoom lens system | |
JPS55111915A (en) | Zoom lens | |
JPS57208522A (en) | Zoom lens capable of close-up photographing | |
JPS5719710A (en) | Zoom lens system capable of macrofocusing | |
JPS5612614A (en) | Compact zoom lens system | |
JPS56161517A (en) | Telephoto zoom lens | |
JPS565518A (en) | Optical correction type variable focal length lens system | |
JPH03265811A (en) | Zoom lens | |
JPH03154014A (en) | Zoom lens |