JPS57201833A - Measuring method for f number of lens - Google Patents

Measuring method for f number of lens

Info

Publication number
JPS57201833A
JPS57201833A JP1453982A JP1453982A JPS57201833A JP S57201833 A JPS57201833 A JP S57201833A JP 1453982 A JP1453982 A JP 1453982A JP 1453982 A JP1453982 A JP 1453982A JP S57201833 A JPS57201833 A JP S57201833A
Authority
JP
Japan
Prior art keywords
lens
level
pupil
equivalent diameters
pinholes
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
Application number
JP1453982A
Other languages
Japanese (ja)
Other versions
JPS644137B2 (en
Inventor
Isao Matsumura
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.)
Canon Inc
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 JP1453982A priority Critical patent/JPS57201833A/en
Publication of JPS57201833A publication Critical patent/JPS57201833A/en
Publication of JPS644137B2 publication Critical patent/JPS644137B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0228—Testing optical properties by measuring refractive power

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To obtain an accurate pupil area independently of the variance of the light quantity level, by using light sources different in diameter and performing the measurement twice with different slice levels of a television signal to correct inclinations of luminance level curves mutually. CONSTITUTION:Pinholes P1 and P2 having radiuses r1 and r2 respectively are compatible with each other. The light from the pinhole placed in the focus position of a lens 1 to be measured projects the picture of a stop 2 of the lens 2 onto a screen 3. The projected pattern has the luminance level adjusted by an ND filter 4 and a transparent glass 6 and is projected onto the surface of a vidicon 9 by a taking lens 8. This projected pattern is swept by scanning lines to change the slice level for obtaining an electric signal. Pinholes are exchanged to obtain respective equivalent diameters of the pupil image for successive combinations of level change, and a true equivalent diameter of the pupil image is operated on a basis of the proportional relation between equivalent diameters of the pupil picture and obtained equivalent diameters, thus obtaining the F number of the lens.
JP1453982A 1982-02-01 1982-02-01 Measuring method for f number of lens Granted JPS57201833A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1453982A JPS57201833A (en) 1982-02-01 1982-02-01 Measuring method for f number of lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1453982A JPS57201833A (en) 1982-02-01 1982-02-01 Measuring method for f number of lens

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP3711074A Division JPS5733534B2 (en) 1974-04-02 1974-04-02

Publications (2)

Publication Number Publication Date
JPS57201833A true JPS57201833A (en) 1982-12-10
JPS644137B2 JPS644137B2 (en) 1989-01-24

Family

ID=11863951

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1453982A Granted JPS57201833A (en) 1982-02-01 1982-02-01 Measuring method for f number of lens

Country Status (1)

Country Link
JP (1) JPS57201833A (en)

Also Published As

Publication number Publication date
JPS644137B2 (en) 1989-01-24

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