JPS5650309A - Soft focus lens - Google Patents

Soft focus lens

Info

Publication number
JPS5650309A
JPS5650309A JP12702779A JP12702779A JPS5650309A JP S5650309 A JPS5650309 A JP S5650309A JP 12702779 A JP12702779 A JP 12702779A JP 12702779 A JP12702779 A JP 12702779A JP S5650309 A JPS5650309 A JP S5650309A
Authority
JP
Japan
Prior art keywords
lens
soft focus
junction
exchanged
lens group
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.)
Pending
Application number
JP12702779A
Other languages
Japanese (ja)
Inventor
Yusuke Nanjo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mamiya Camera Co Ltd
Original Assignee
Mamiya Camera Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mamiya Camera Co Ltd filed Critical Mamiya Camera Co Ltd
Priority to JP12702779A priority Critical patent/JPS5650309A/en
Publication of JPS5650309A publication Critical patent/JPS5650309A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G02B27/0068—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration having means for controlling the degree of correction, e.g. using phase modulators, movable elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/20—Soft-focus objectives

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To obtain a soft focus lens which does not change the focus position and is advantageous, by constituting the lens group consisting of three lenses so that the center lens can be exchanged and the lens group may be the soft focus lens when the center lens is exchanged for a junction lens. CONSTITUTION:The soft focus lens consists of three lens groups A, B and C in order from the object side, and the stop is arranged just before lens C, and lens groups A and C are connected into one body. When refractive indexes before and after the junction face of the junction lens of lens group B, the curvature radius of the junction face and the stop radius for opening are denoted as nB, nB', rB and R respectively, expressions I and II are satisfied. Lens group B can be exchanged; and when single lens B-L is used as lens group B, a general photographic lens is obtained; and when junction lens B-2 is used, a soft focus lens is obtained. Further, this soft focus lens is so constituted that the focus position and the back focus may be hardly changed even if lens group B is exchanged.
JP12702779A 1979-10-02 1979-10-02 Soft focus lens Pending JPS5650309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12702779A JPS5650309A (en) 1979-10-02 1979-10-02 Soft focus lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12702779A JPS5650309A (en) 1979-10-02 1979-10-02 Soft focus lens

Publications (1)

Publication Number Publication Date
JPS5650309A true JPS5650309A (en) 1981-05-07

Family

ID=14949857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12702779A Pending JPS5650309A (en) 1979-10-02 1979-10-02 Soft focus lens

Country Status (1)

Country Link
JP (1) JPS5650309A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4948236A (en) * 1988-02-19 1990-08-14 Asahi Kogaku Kogyo Kabushiki Kaisha Soft-focus lens system
DE4033978A1 (en) * 1989-10-25 1991-05-02 Asahi Optical Co Ltd SOFT DRAWER LENS SYSTEM
EP0859259A2 (en) * 1997-02-14 1998-08-19 Nikon Corporation Adapter for correcting spherical aberrations of objective lens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5323626A (en) * 1976-08-17 1978-03-04 Canon Inc Soft-focus lens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5323626A (en) * 1976-08-17 1978-03-04 Canon Inc Soft-focus lens

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4948236A (en) * 1988-02-19 1990-08-14 Asahi Kogaku Kogyo Kabushiki Kaisha Soft-focus lens system
DE4033978A1 (en) * 1989-10-25 1991-05-02 Asahi Optical Co Ltd SOFT DRAWER LENS SYSTEM
US5267086A (en) * 1989-10-25 1993-11-30 Asahi Kogaku Kogyo K.K. Soft focus lens system
EP0859259A2 (en) * 1997-02-14 1998-08-19 Nikon Corporation Adapter for correcting spherical aberrations of objective lens
EP0859259A3 (en) * 1997-02-14 1999-09-22 Nikon Corporation Adapter for correcting spherical aberrations of objective lens

Similar Documents

Publication Publication Date Title
JPS5450321A (en) Telescopic lens having high relative aperture
JPS5432319A (en) Fish eye lens
JPS6438711A (en) Zoom lens
JPS5263330A (en) Focal distance variable system by composite lens
JPS5363014A (en) Inverse galiled finder of variable magnification type
GB1534541A (en) Optical systems
JPS5581316A (en) Lens system for copying
JPS53131835A (en) Reflecting objective lens
JPS6452111A (en) Compact zoom lens
JPS5650309A (en) Soft focus lens
JPS5411754A (en) Eye-piece photomicrography
JPS52130631A (en) Photographic lens of large aperture and super wide angle
JPS5397451A (en) Zoom lens system
JPS5451826A (en) Photographic lens
JPS5694318A (en) Lens system provided with rear converter lens
JPS5443725A (en) Standard photographic lens
GB967775A (en) Optical objectives
JPS53135657A (en) Eye lens in eyepiece system
GB941930A (en) Photographic objectives
JPS52146620A (en) Gauss type lens
JPS57108822A (en) Eyepiece
JPS5596915A (en) Compact large aperture ratio lens
JPS5436746A (en) Objective lens of microscope
JPS5555308A (en) Endscope optical lens
JPS5541433A (en) Variable power eyepiece lens