JPS63147123A - Photographic lens with variable optical characteristic - Google Patents

Photographic lens with variable optical characteristic

Info

Publication number
JPS63147123A
JPS63147123A JP29535586A JP29535586A JPS63147123A JP S63147123 A JPS63147123 A JP S63147123A JP 29535586 A JP29535586 A JP 29535586A JP 29535586 A JP29535586 A JP 29535586A JP S63147123 A JPS63147123 A JP S63147123A
Authority
JP
Japan
Prior art keywords
lens
distance
short
floating
refracting power
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
JP29535586A
Other languages
Japanese (ja)
Inventor
Hiroshi Endo
Takashi Matsushita
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP29535586A priority Critical patent/JPS63147123A/en
Publication of JPS63147123A publication Critical patent/JPS63147123A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To perform high-performance floating while compensating excellently aberrational variation when a body in a wide long and short distance range is put in focus by composing a photographic lens of four groups and moving them specific conditions.
CONSTITUTION: This photographic lens has a 1st group I with positive refracting power, a 2nd lens group II with positive refracting power, a 3rd lens group III with negative refracting power, and a 4th lens group IV with positive refract ing power i.e. four lens group in order from an object side. When focusing is performed from an infinite distance body to a short-distance body, the floating is carried out by moving the 1stW4th lens groups IWIV so that three all of air formed of two adjacent lens group respectively increased. Then when the short-distance object is put in focus, only the 4th lens group IV is moved on the optical axis to vary optical characteristics. Consequently, some lens groups which have aberrations compensated excellent and utilized the floating are used to reduce a stopping-down quantity, specially, at the time of short-distance photography and vary image plane characteristics mainly and optionally.
COPYRIGHT: (C)1988,JPO&Japio
JP29535586A 1986-12-11 1986-12-11 Photographic lens with variable optical characteristic Pending JPS63147123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29535586A JPS63147123A (en) 1986-12-11 1986-12-11 Photographic lens with variable optical characteristic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29535586A JPS63147123A (en) 1986-12-11 1986-12-11 Photographic lens with variable optical characteristic

Publications (1)

Publication Number Publication Date
JPS63147123A true JPS63147123A (en) 1988-06-20

Family

ID=17819542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29535586A Pending JPS63147123A (en) 1986-12-11 1986-12-11 Photographic lens with variable optical characteristic

Country Status (1)

Country Link
JP (1) JPS63147123A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012242472A (en) * 2011-05-17 2012-12-10 Sigma Corp Image forming optical system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012242472A (en) * 2011-05-17 2012-12-10 Sigma Corp Image forming optical system

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