JPS55164805A - Reverse telephoto type wide-angle lens - Google Patents

Reverse telephoto type wide-angle lens

Info

Publication number
JPS55164805A
JPS55164805A JP7290479A JP7290479A JPS55164805A JP S55164805 A JPS55164805 A JP S55164805A JP 7290479 A JP7290479 A JP 7290479A JP 7290479 A JP7290479 A JP 7290479A JP S55164805 A JPS55164805 A JP S55164805A
Authority
JP
Japan
Prior art keywords
lens
lenses
conditions
specify
focal length
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
JP7290479A
Other languages
Japanese (ja)
Other versions
JPS6232763B2 (en
Inventor
Sho Tokumaru
Akiyoshi Nakamura
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 JP7290479A priority Critical patent/JPS55164805A/en
Priority to US06/151,445 priority patent/US4382662A/en
Publication of JPS55164805A publication Critical patent/JPS55164805A/en
Publication of JPS6232763B2 publication Critical patent/JPS6232763B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To obtain the single-lens reflex camera of back focus longer than its focal length and a small size by letting the lens composed of single lenses or cemented lenses of the 1stW9th lenses from the object side and satisfying the specified conditions.
CONSTITUTION: The lens consists of single lenses or cemented lenses L1WL9 of the 1stW9th groups from the object side and the respective lenses are so formed as to satisfy conditions 1W4. The conditions 1 specify the composite focal length of the divergent group constituted by a positive meniscus lens L1, negative meniscus single lenses L2, L3, biconvex single lens L4. The conditions 2, 3 specify the refractive power and shape of the positive meniscus signal lens L5. The conditions 4 specify the air spacing between the lens L5 and biconvex single lens L6. By satisfying these conditins 1W4, the miniature reverse telephoto type wide-angle lens for single-lens reflex cameras of an aperture ratio 1:2.0 or more, an angle of view as wide as 84° and back focus longer than the focal length may be obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP7290479A 1979-06-08 1979-06-08 Reverse telephoto type wide-angle lens Granted JPS55164805A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP7290479A JPS55164805A (en) 1979-06-08 1979-06-08 Reverse telephoto type wide-angle lens
US06/151,445 US4382662A (en) 1979-06-08 1980-05-19 Inverted telephoto type wide angle lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7290479A JPS55164805A (en) 1979-06-08 1979-06-08 Reverse telephoto type wide-angle lens

Publications (2)

Publication Number Publication Date
JPS55164805A true JPS55164805A (en) 1980-12-22
JPS6232763B2 JPS6232763B2 (en) 1987-07-16

Family

ID=13502794

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7290479A Granted JPS55164805A (en) 1979-06-08 1979-06-08 Reverse telephoto type wide-angle lens

Country Status (1)

Country Link
JP (1) JPS55164805A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932634A1 (en) * 1988-09-30 1990-04-05 Asahi Optical Co Ltd RETROFOCUS WIDE-ANGLE LENS SYSTEM

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4912822A (en) * 1972-05-10 1974-02-04
JPS5339759A (en) * 1976-09-22 1978-04-11 Asahi Optical Co Ltd Small sized bright wide zoom lens
JPS53135658A (en) * 1977-04-30 1978-11-27 Asahi Optical Co Ltd Zoom lens including ultraawide lens
JPS5415733A (en) * 1977-06-10 1979-02-05 Asahi Optical Co Ltd Lowwmagnification variableeangleelens system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4912822A (en) * 1972-05-10 1974-02-04
JPS5339759A (en) * 1976-09-22 1978-04-11 Asahi Optical Co Ltd Small sized bright wide zoom lens
JPS53135658A (en) * 1977-04-30 1978-11-27 Asahi Optical Co Ltd Zoom lens including ultraawide lens
JPS5415733A (en) * 1977-06-10 1979-02-05 Asahi Optical Co Ltd Lowwmagnification variableeangleelens system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3932634A1 (en) * 1988-09-30 1990-04-05 Asahi Optical Co Ltd RETROFOCUS WIDE-ANGLE LENS SYSTEM

Also Published As

Publication number Publication date
JPS6232763B2 (en) 1987-07-16

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