JPS5774719A - Finder device of single-lens reflex camera - Google Patents

Finder device of single-lens reflex camera

Info

Publication number
JPS5774719A
JPS5774719A JP55152580A JP15258080A JPS5774719A JP S5774719 A JPS5774719 A JP S5774719A JP 55152580 A JP55152580 A JP 55152580A JP 15258080 A JP15258080 A JP 15258080A JP S5774719 A JPS5774719 A JP S5774719A
Authority
JP
Japan
Prior art keywords
lens
positive
negative
finder
principal
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
JP55152580A
Other languages
Japanese (ja)
Inventor
Yasuo Yamazaki
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP55152580A priority Critical patent/JPS5774719A/en
Publication of JPS5774719A publication Critical patent/JPS5774719A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)
  • Telescopes (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To increase the magnification of a finder by interposing a magnifier lens system composed of two positive and negative lenses, between a pentagonal prism and an eyepiece. CONSTITUTION:Between the pentagonal prism P and eyepiece L3 of a finder system having a focal plate Re, the system of a positive lens L1 and a negative lens L2 is interposed to obtain a magnification mode. This lens system is moved back to obtain a normal mode. In this case, respective lens characteristics of the interposed lens system should meet requirements as shown by the equation. In the figure, phi1 is the refractivity of the positive lens L1, phi2 is the refractivity of the negative lens L2, and DELTA is the sum of the principal-point interval of the positive lens L1 and that of the negative lens L2; and S1 is the optical distance from the front principal point of the lens L1 to the focal plane Re, and (d) is the distance between the principal points of the lenses L1 and L2.
JP55152580A 1980-10-29 1980-10-29 Finder device of single-lens reflex camera Pending JPS5774719A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55152580A JPS5774719A (en) 1980-10-29 1980-10-29 Finder device of single-lens reflex camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55152580A JPS5774719A (en) 1980-10-29 1980-10-29 Finder device of single-lens reflex camera

Publications (1)

Publication Number Publication Date
JPS5774719A true JPS5774719A (en) 1982-05-11

Family

ID=15543567

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55152580A Pending JPS5774719A (en) 1980-10-29 1980-10-29 Finder device of single-lens reflex camera

Country Status (1)

Country Link
JP (1) JPS5774719A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5255030A (en) * 1990-08-31 1993-10-19 Minolta Camera Kabushiki Kaisha Camera
US5363163A (en) * 1991-05-14 1994-11-08 Minolta Camera Kabushiki Kaisha Finder optical system for pseudo focal length

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5255030A (en) * 1990-08-31 1993-10-19 Minolta Camera Kabushiki Kaisha Camera
US5363163A (en) * 1991-05-14 1994-11-08 Minolta Camera Kabushiki Kaisha Finder optical system for pseudo focal length

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