US2847907A - Variable focal-length objectives - Google Patents

Variable focal-length objectives Download PDF

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Publication number
US2847907A
US2847907A US558356A US55835656A US2847907A US 2847907 A US2847907 A US 2847907A US 558356 A US558356 A US 558356A US 55835656 A US55835656 A US 55835656A US 2847907 A US2847907 A US 2847907A
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component
convergent
divergent
focal length
curvature
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US558356A
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Angenieux Pierre
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
    • G02B15/143105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +-+

Definitions

  • This invention relates in general to variablevfocallength objectives and particularly to a variable focallength objective of the type wherein the variations in magnification result essentially from the axial displacements of a divergent component disposed between two convergent components, the image produced by the complete system being maintained in a fixed position with the assistance of another axial movement of either one of said convergent components or simply one part of the said components.
  • a device of the type indicated herein above may be developed by disregarding in a first study the possibility of maintaining the lixedness of the final image. and Aby limiting the first approach to this problem to the formation, in the first place, of an optical system consisting of two fixed convergent components between which a divergent component is axially movable to simply provide a continuous variation in the magnification of the image resulting from the complete assembly.
  • the movable divergent component must consist of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which 2,847,907 Patented Aug. 19, 1958 ICC is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of said focal length.
  • the rear member of the said divergent component has a concave front surface the radius of curvature of which is numerically greater than the focal length of said divergent component and smaller than infinity, the other lens of said pair of separate lenses, which is positioned behind the former, having a concave front surface with a radius of curvature numerically greater than the focal length of said divergent component.
  • the divergent component must be achromatic; therefore, at least one of the lenses constituting this component will consist of a convergent lens cemented on a divergent lens, the convergent lens having a dispersion ratio or Abbe number v1 lower than that v2 of the divergent lens, the difference i12- iq ranging preferably from l5 to 38.
  • a front convergent component a doublet consisting of a divergent meniscus lens having its convex surface positioned at the front, and of a convergent lens positioned behind this meniscus.
  • These two lenses may be cemented together but this is not an essential requirement.
  • the convex surface located at the front of the meniscus it is advantageous to select a radius of curvature ranging from 40% to 100% of the focal length of the convergent component -in question, the radius of curvature of the rear surface of said divergent meniscus ranging preferably from 20% to 50% of this focal length.
  • the back focal length of this assembly varies if the other two components remain stationary.
  • the front convergent component may also be moved along its axis according to the law governing the positions of these two components with respect to the fixed convergent component in view of maintaining the back focal length of the assembly at a constant value.
  • the same result may be obtained by maintaining the front convergent component in a fixed position and utilizing the rear convergent component as a second movable component; but it is advantageous to select a rear convergent component constituted by two parts of which one is utilized as a second movable component. In this case, the diaphragm will be positioned between these two parts. Three cases may occur: both parts are convergent; the front part is convergent while the rear part is divergent; the front part is divergent while the rear part is convergent.
  • the front part is convergent, it is interesting to constitute it by two separate convergent lenses, either simple or made of cemented lenses, of which the former, at the front, is biconvex and has on both surfaces a radius of curvature numerically greater than of, and smaller than five times, the focal length of said front part, while the other lens, located at the rear of the same part, has a convex front surface having a radius of curvature greater than 60% of, and smaller than three times, the focal length of said part.
  • the front part is divergent, it can be constituted by a simple biconcave lens.
  • Figs. 1 and 2 of the attached drawing illustrate diagrammatically in axial section two practical forms of embodiment of a variable focal-length objective made in accordance with the teachings of this invention.
  • C1, C2 and C3 designate, from the front to the rear, the three cornponents of the objective, while P1 and P2 designate the two parts of component C3, said two parts in this case being convergent;
  • e1, e2 em designate the thicknesses and axial distances between the components, parts or lenses,
  • R1, R2 R1 designate the radiuses of curvature of each lens surface.
  • the characteristics of this first form of embodiment are given in the Table I below, the reference symbols R1, R2, R3 R17 representing as in the drawing the radiuses of curvature of each lens surface from the front to the rear, the sign indicating that the surface is convex towards the front and the sign that it is concave towards the front, whilst e1, e2, e3 e16, as in the drawing designate the axial distances measured between two adjacent lens surfaces, e3 representing the axial distance measured between the front convergent component C1 and the divergent component C2, eB representing on the other hand the axial distance separating the divergent component C2 from the front part P1 of the rear component C3, and e13 being the axial distance measured between the two parts P1, P2 of the rear component C3.
  • the focal length of the front convergent component C1 is 100.34 millimeters.
  • component C2 is 30.33 millimeters.
  • the focal length of the front part P1 of the rear component C3 is 21.35 millimeters.
  • the front convergent component C1 may be moved axially in accordance .with the law governing the positions of these two components in view of obtaining a constant back focal length in the complete system however, it is preferable to leave the front component C1 in a fixed position and to cause the front part P1 of the rear component C3 to move axially, this last-mentioned part P1 being located between the air gaps e8 and e13.
  • the focal distance varies from 21.7 mm. to 80 mm.
  • the two parts of the rear component C3 are respectively divergent and convergent.
  • C1, C2 and C1 designate the three componentsl of the objective
  • P'1 and Pz designate the two parts of component C3, part
  • the focal length of the divergent P'1 being divergent while part P'2 is convergent; e1, e2
  • e1 designate the thicknesses and axial distances between the components, parts or lenses
  • R1, R2, R18 designate the radiuses of curvature of each lens surface.
  • the characteristics of this second form of embodiment are given in the Table Il below, in which, as in the drawing, the reference symbols R1, R2 R18 represent the radiuses of curvature of each lens surface from the front to the rear, the sign -1- indicating that the surface is convex towards the front, and the sign that it is concave towards the front, whilst e1, e2, e3 e1, designate the axial distances measured between two adjacent lens surfaces, e3 representing the axial distance measured between the front convergent compo-nent C1 and the divergent component C2, e8 representing the axial distance separating the divergent component C2 from the front part P2 of the rear component C3, e111 being the axial distance measured between the two parts P'1 and P'2 of the rear component C3.
  • the focal length of the fixed front convergent component C1 is 100.34 millimeters.
  • the focal length of the divergent component C2 is 30.33 millimeters.
  • the focal length of the front part P'1 of the rear component C'3 is millimeters.
  • the front convergent component C1 may be moved axially in accordance with the law governing the positions of these two components in view of obtaining a constant back focal length in the complete system; however, according to the invention, it is preferable to leave the front component C1 in a fixed position and to cause the front part P'1 of the rear component C3 to move axially, this last-mentioned part P'1 being located between the air gaps e8 and e111.
  • the focal distance varies from 22.80 mm. to 85.08 mm.
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components, said divergent component consisting of at least three lens elements arranged as two members separated by an4 air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, the said divergent component being axially movable in order to obtain a continuous variation of the focal length of the complete system.
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, the rrear member of the said divergent component having a concave front surface the radius of curvature of which is numerically greater than the focal length of said divergent component and smaller than infinity, the said divergent component being axially movable in order to obtain a continuous variation of the focal length of the complete system.
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components', said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than innity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, and the said convergent component positioned at the rear consisting of two parts, one xed rear part and one movable front part, said movable front part and said divergent component being axially and simultaneously movable in order to obtain a continuous variation of the focal length of the complete system and ensuring to the complete system a constant back focal length.
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent cornponents, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length,'the rear member of the said divergent coinponent having a concave front surface the radius of curvature of which is numerically greater than the focal length of said divergent component and smaller than infinity and the said convergent component positioned at the rear consisting of two parts, one fixed rear part and one movable front part, said movable front part and said divergent component being axially and simultaneously movable in order to obtain a continuous variation
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, the said divergent component being axially movable in order to obtain a continuous variation of the focal length of the complete system, and means for displacing also along its axis said front convergent component in accordance with the positions of these two components with respect to the, fixed convergent component located at the rear, in View of obtaining a constant back focal length in the complete assembly.
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is'numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, one of said two members constituting the divergent component consisting of a convergent lens cemented on a divergent lens, said convergent lens having a dispersion ratio or Abbe number lower than that of said divergent lens, the said divergent component being axially movable in order to obtain a continuous variation of the focal length of the complete assembly.
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent compo- ⁇ nents, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, the said divergent component being axially movable in order to obtain a continuous variation of the focal length of the complete system, the convergent component positioned at the front of the system consisting 5 of two lenses, the front lens of which being a divergent meniscus, the convex surface of which is located at the front, said convex surface having a radius of curvature greater than 40% and smaller than 100% of the focal
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of vcurvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, and the said convergent component positioned at the rear consisting of two parts, one xed rear part and one movable front part, the said movable front part of said rear convergent component consisting of a pair of separate lenses both of convergent character, the first lens at the front of said pair being biconvex, its two surfaces having a radius of curvature numerically greater than 150% and smaller than 500% of
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, and the said convergent component positioned at the rear consisting of two parts, one xed rear part and one movable front part, the said movable front part of said rear convergent component consisting of a pair of separate lenses both of convergent character, the first lens at the front of said pair being biconvex, its two surfaces having a radius of curvature numerically greater than 150% and smaller than 500% of the focal
  • a variable focal-length objective comprising a convergent component positioned at the front, a convergent component positioned at the rear, and a divergent component positioned between said two convergent components, said divergent component consisting of at least three lens elements arranged as two members separated by an air space, the front member having a front concave surface the radius of curvature of which is numerically greater than 200% of the focal length of said divergent component and smaller than infinity, and a rear concave surface the radius of curvature of which is numerically greater than 70% and smaller than 300% of the said focal length, and the said convergent component positioned at the rear consisting of two parts, one fixed rear part and one movable front part consisting of a divergent lens, the said movable front part and said divergent component being axially and simultaneously movable in order to obtain a continuous variation of the focal length of the complete system and ensuring to the said complete system a constant back focal length.

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  • General Physics & Mathematics (AREA)
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US558356A 1955-01-24 1956-01-10 Variable focal-length objectives Expired - Lifetime US2847907A (en)

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FR1120271T 1955-01-24
FR67970T 1955-07-02

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925010A (en) * 1959-01-15 1960-02-16 Wollensak Optical Co Variable focal length lens
US3000259A (en) * 1960-03-07 1961-09-19 Revere Camera Co Variable magnification lens system
US3004471A (en) * 1958-06-06 1961-10-17 Taylor Taylor & Hobson Ltd Control devices for optical objectives of variable focal length
US3027805A (en) * 1958-10-22 1962-04-03 Canon Camera Co Zoom lens system
US3034404A (en) * 1958-11-13 1962-05-15 Paillard Sa Variable focal objectives
US3038378A (en) * 1959-01-12 1962-06-12 Bell & Howell Co Variable focal length optical objective
US3045546A (en) * 1957-10-02 1962-07-24 Taylor Taylor & Hobson Ltd Optical objectives of variable focal length
US3057257A (en) * 1959-02-17 1962-10-09 Schneider Co Optische Werke High-speed photographic or cinematographic varifocal objective
US3074318A (en) * 1959-09-05 1963-01-22 Canon Camera Co Zoom lens system
US3074317A (en) * 1959-12-24 1963-01-22 Bell & Howell Co Zoom lens
DE1167555B (de) * 1959-11-25 1964-04-09 Kodak Ag Afokales Objektivvorsatzsystem mit veraenderlicher Vergroesserung
US3160699A (en) * 1960-06-27 1964-12-08 Canon Camera Co Photographic zoom objective
US3191496A (en) * 1959-09-03 1965-06-29 Rank Organisation Ltd Optical objectives of variable focal length of the zoom type and control means therefor
DE1197243B (de) * 1960-08-05 1965-07-22 Schneider Co Optische Werke Lichtstarkes photographisches oder kinemato-graphisches Aufnahmeobjektiv mit veraenderlicher Brennweite
DE1197644B (de) * 1960-12-31 1965-07-29 Rodenstock Optik G Optisches System mit veraenderbarer Brennweite
US3220307A (en) * 1960-12-05 1965-11-30 James E Thurow Variable focal length lens system having linear differential motion between lens unit
DE1209770B (de) * 1961-07-26 1966-01-27 Schneider Co Optische Werke Lichtstarkes Vario-Objektiv
DE1218178B (de) * 1959-12-24 1966-06-02 Bell & Howell Co Objektiv mit kontinuierlich veraenderbarer Brennweite
US3270615A (en) * 1961-08-15 1966-09-06 Nippon Kogaku Kk Three component zoom lens for photographic miniature cameras
DE1255945B (de) * 1961-12-30 1967-12-07 Agfa Ag Projektionsobjektiv variabler Brennweite
US3366437A (en) * 1963-03-23 1968-01-30 Sankyo Kigaku Kogyo Kabushiki Zoom lens having two movable negative lens members disposed between two positive lens members
DE1263338B (de) * 1967-04-13 1968-03-14 Nippon Kogaku Kk Pankratisches Objektiv
US3377119A (en) * 1963-01-21 1968-04-09 Canon Camera Co Mechanically compensated zoom lens system
DE1286308B (de) * 1966-09-14 1969-01-02 Asahi Optical Co Ltd Objektiv veraenderbarer Brennweite
DE2034349A1 (de) * 1969-07-12 1971-02-04 Canon K K , Tokio Variooptik
US3784284A (en) * 1970-07-25 1974-01-08 Nippon Kogaku Kk Zoom lens system for close up photography
US3994571A (en) * 1973-12-07 1976-11-30 Canon Kabushiki Kaisha Zoom lens system having a focusing lens consisting of only one lens component
US4462664A (en) * 1979-10-05 1984-07-31 Vivitar Corporation Zoom lens
US4576443A (en) * 1982-08-25 1986-03-18 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens with high variable power ratio including wide-angle capability
US4629291A (en) * 1980-10-01 1986-12-16 Vivitar Corporation Zoom lens

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959101A (en) * 1957-09-20 1960-11-08 Bell & Howell Co Optical objective of variable equivalent focal length
US2937572A (en) * 1958-01-14 1960-05-24 Canon Camera Co Varifocal lens systems
US3330615A (en) * 1963-05-06 1967-07-11 Eastman Kodak Co Zoom lens
US3547523A (en) * 1967-07-13 1970-12-15 Konishiroku Photo Ind Zoom objective lens system with highly reduced secondary chromatic aberration
JPS6035649B2 (ja) * 1977-05-18 1985-08-15 キヤノン株式会社 光学補正型ズ−ムレンズ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165341A (en) * 1936-07-28 1939-07-11 Eastman Kodak Co Photographic objective
US2179850A (en) * 1937-03-17 1939-11-14 American Optical Corp Optical system for measuring changes in magnification
US2353565A (en) * 1943-11-04 1944-07-11 Isadore Nochlin And Sam Schwar Optical view finder
US2514239A (en) * 1948-07-02 1950-07-04 Watson W & Sons Ltd Variable magnification optical system
US2566485A (en) * 1949-01-28 1951-09-04 Optique & De Mecanique De Haut Auxiliary optical device with variable magnifying power
US2649025A (en) * 1950-09-22 1953-08-18 Taylor Taylor & Hobson Ltd Optical objective of variable focal length
US2663223A (en) * 1950-07-18 1953-12-22 Watson W & Sons Ltd Variable magnification optical system
FR1081948A (fr) * 1953-05-13 1954-12-23 Optique & De Mecanique De Haut Nouveau dispositif optique à distance focale variable

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165341A (en) * 1936-07-28 1939-07-11 Eastman Kodak Co Photographic objective
US2179850A (en) * 1937-03-17 1939-11-14 American Optical Corp Optical system for measuring changes in magnification
US2353565A (en) * 1943-11-04 1944-07-11 Isadore Nochlin And Sam Schwar Optical view finder
US2514239A (en) * 1948-07-02 1950-07-04 Watson W & Sons Ltd Variable magnification optical system
US2566485A (en) * 1949-01-28 1951-09-04 Optique & De Mecanique De Haut Auxiliary optical device with variable magnifying power
US2663223A (en) * 1950-07-18 1953-12-22 Watson W & Sons Ltd Variable magnification optical system
US2649025A (en) * 1950-09-22 1953-08-18 Taylor Taylor & Hobson Ltd Optical objective of variable focal length
FR1081948A (fr) * 1953-05-13 1954-12-23 Optique & De Mecanique De Haut Nouveau dispositif optique à distance focale variable

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3045546A (en) * 1957-10-02 1962-07-24 Taylor Taylor & Hobson Ltd Optical objectives of variable focal length
US3004471A (en) * 1958-06-06 1961-10-17 Taylor Taylor & Hobson Ltd Control devices for optical objectives of variable focal length
US3027805A (en) * 1958-10-22 1962-04-03 Canon Camera Co Zoom lens system
US3034404A (en) * 1958-11-13 1962-05-15 Paillard Sa Variable focal objectives
US3038378A (en) * 1959-01-12 1962-06-12 Bell & Howell Co Variable focal length optical objective
US2925010A (en) * 1959-01-15 1960-02-16 Wollensak Optical Co Variable focal length lens
US3272073A (en) * 1959-02-17 1966-09-13 Schneider Co Optische Werke High-speed photographic or cinematographic varifocal objective
US3057257A (en) * 1959-02-17 1962-10-09 Schneider Co Optische Werke High-speed photographic or cinematographic varifocal objective
US3191496A (en) * 1959-09-03 1965-06-29 Rank Organisation Ltd Optical objectives of variable focal length of the zoom type and control means therefor
US3074318A (en) * 1959-09-05 1963-01-22 Canon Camera Co Zoom lens system
DE1167555B (de) * 1959-11-25 1964-04-09 Kodak Ag Afokales Objektivvorsatzsystem mit veraenderlicher Vergroesserung
US3074317A (en) * 1959-12-24 1963-01-22 Bell & Howell Co Zoom lens
DE1218178B (de) * 1959-12-24 1966-06-02 Bell & Howell Co Objektiv mit kontinuierlich veraenderbarer Brennweite
US3000259A (en) * 1960-03-07 1961-09-19 Revere Camera Co Variable magnification lens system
US3160699A (en) * 1960-06-27 1964-12-08 Canon Camera Co Photographic zoom objective
DE1197243B (de) * 1960-08-05 1965-07-22 Schneider Co Optische Werke Lichtstarkes photographisches oder kinemato-graphisches Aufnahmeobjektiv mit veraenderlicher Brennweite
US3220307A (en) * 1960-12-05 1965-11-30 James E Thurow Variable focal length lens system having linear differential motion between lens unit
DE1197644B (de) * 1960-12-31 1965-07-29 Rodenstock Optik G Optisches System mit veraenderbarer Brennweite
DE1209770B (de) * 1961-07-26 1966-01-27 Schneider Co Optische Werke Lichtstarkes Vario-Objektiv
US3273457A (en) * 1961-07-26 1966-09-20 Josef Schneider & Co Objective system comprising a principal objective and a four-component attachment
DE1259596B (de) * 1961-07-26 1968-01-25 Schneider Co Optische Werke Lichtstarkes Vario-Objektiv
US3270615A (en) * 1961-08-15 1966-09-06 Nippon Kogaku Kk Three component zoom lens for photographic miniature cameras
DE1255945B (de) * 1961-12-30 1967-12-07 Agfa Ag Projektionsobjektiv variabler Brennweite
US3377119A (en) * 1963-01-21 1968-04-09 Canon Camera Co Mechanically compensated zoom lens system
US3366437A (en) * 1963-03-23 1968-01-30 Sankyo Kigaku Kogyo Kabushiki Zoom lens having two movable negative lens members disposed between two positive lens members
DE1286308B (de) * 1966-09-14 1969-01-02 Asahi Optical Co Ltd Objektiv veraenderbarer Brennweite
DE1263338B (de) * 1967-04-13 1968-03-14 Nippon Kogaku Kk Pankratisches Objektiv
DE2034349A1 (de) * 1969-07-12 1971-02-04 Canon K K , Tokio Variooptik
US3784284A (en) * 1970-07-25 1974-01-08 Nippon Kogaku Kk Zoom lens system for close up photography
US3994571A (en) * 1973-12-07 1976-11-30 Canon Kabushiki Kaisha Zoom lens system having a focusing lens consisting of only one lens component
US4462664A (en) * 1979-10-05 1984-07-31 Vivitar Corporation Zoom lens
US4629291A (en) * 1980-10-01 1986-12-16 Vivitar Corporation Zoom lens
US4576443A (en) * 1982-08-25 1986-03-18 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens with high variable power ratio including wide-angle capability

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Publication number Publication date
FR1120271A (fr) 1956-07-03
FR67970E (fr) 1958-03-26

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