US3751136A - Variable focal length anamorphotic cinecamera systems - Google Patents

Variable focal length anamorphotic cinecamera systems Download PDF

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Publication number
US3751136A
US3751136A US00175513A US3751136DA US3751136A US 3751136 A US3751136 A US 3751136A US 00175513 A US00175513 A US 00175513A US 3751136D A US3751136D A US 3751136DA US 3751136 A US3751136 A US 3751136A
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afocal
anamorphotic
lens
focal length
view
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K Kirchhoff
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/08—Anamorphotic objectives
    • 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
    • G02B15/22—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 with movable lens means specially adapted for focusing at close distances

Definitions

  • ABSTRACT A variable focal length cinecamera system consisting of an afocal auxiliary lens system by means of which, through modification of the spacing between optical elements constituting the said lens system, the focal length of the system can be changed while the intercept length is maintained constant, and of a succeeding permanently installed basic lens focused at infinity.
  • An afocal anamorphotic system is provided between the afocal auxiliary lens system and the basic lens.
  • the present invention relates to a variable focal length cinecamera system.
  • the invention embodies an optical arrangement for the exposure of anamorphotic film films of wide-screen format, using conventional variable focal length systems (zoom lenses).
  • the primary object of the invention is to overcome this drawback and to achieve a practical result which requires hardly any enlargement of the optical parts of the camera system as compared with nonanamorphotic (orthomorphotic) camera lenses of the variable focal length kind.
  • variable focal length camera lenses consist of a zoom section and a fixed basic lens and in which a front element is used for focussing (range-finding). Often, at any rate in the Gaussian area of reproduction, these lenses possess a telecentric ray path between the zoom section and the basic lens.
  • lenses of this kind are provided with a prism which, through an inclined partially mirrored surface, reflect out part of the passing radiation in a direction generally perpendicular to the optical axis.
  • This reflected light fraction is picked up by a viewfinder optical system and can also be employed for light-metering purposes.
  • the camera diaphragm In front of the basic lens in most cases the camera diaphragm is arranged and this regulates (either manually or under the control of a photoelectric cell) the quantity of light arriving on the film.
  • the present invention consists in the use of zoom systems with a basic lens, which are so corrected that between the zoom and basic sections not only is there a telecentric ray path in the Gaussian area but also that in this space the widely divergent reproduction rays for all the image points are telecentric and as far as possible exhibit no zoning, an anamorphotic system being arranged in this space.
  • the said space is in a thus-corrected zoom system, is used to accommodate the anamorphotic system, has the major advantage that in this space of the zoom lens, despite changes in focal length and modification of the camera focus, the ray path is always constant so that the anamorphotic system can be more effectively corrected; in contrast to this, in the conventional anamorphotic auxiliary lenses, the adjustment of the ensuing zoom system results in a change in the angular fields and apertural angles of the rays, with focal length.
  • a further advantage resides in the fact that the anamorphotic system is located in said space in the immediate vicinity of the diaphragm at the location of the narrowest point in the ray system) and thus occupies the least possible amount of space in, terms of diameter and length.
  • the focussing facility provided in the zoom system by the adjustment of the front element is operative simultaneously for the zoom system, the anamorphotic section and the basic lens.
  • prism systems can, if installed in fixed, nonpivoting fashion, be strictly achromatic and consist of only two prisms each.
  • these prisms In contrast to the cylindrical system, these prisms, provided that their ray path has been adequately telecentrically corrected, produce no inherent reproduction abberations of the kind caused by surface curvatures. In effect, they only have to be corrected for the transverse colour error and for symmetry of distortion.
  • the invention secures especial advantages in the context of the use of prismatic anamorphic systems when they are applied to zoom systems of certain kinds to be more fully described hereinafter, for anamorphotic reproduction which systems already incorporate a prism for reflecting out a certain proportion of the light for viewing purposes.
  • the available prism for splitting off this light fraction can be replaced by one of the two acromatic prisms and this so designed that it also performs the requisite splitting function for the view-finder.
  • the anamorphotic prism provided here which at the same time splits off the light fraction for the view-finder image, has an entry face which is perpendicular to the optical axis, while the partially mirrored surface is at 45 to the optical axis.
  • the entry face and the surface of the prism used to split off the viewfinder light fraction can equally well subtend other angles with the optical axis.
  • the anamorphotic plane can, in accordance with the invention, be located vertically and/or horizontally.
  • the light fraction which is split off for the view-finder is taken in the direction of the anamorphotic plane.
  • the entry face of the first prism is-used to reflect out the light fraction for the view-finder.
  • a suitable face on the second prism (the one adjacent to the basic lens), can be used for this purpose.
  • FIG. I illustrates a conventional zoom system
  • FIG. 2 illustrates a conventional zoom system in which part of the light is supplied to a view-finder and focussing telescope
  • FIG. 3 is a vertical section through a first arrangement in accordance with the present invention:
  • FIG. 4 is a horizontal section through the arrangement of FIG. 3;
  • FIG. 5 is a vertical section through a second embodiment of the invention. 7
  • FIG. 6 is a plan view of the embodiment of FIG. 5;
  • FIG. 7 is a vertical section through a third embodiment of the invention.
  • FIG. 8 is a plan view of the embodiment of FIG. 7;
  • FIG. 9 is a vertical section through an anamorphotic prism system, suitable for the implementation of the invention, which incorporates facilities for the splitting off of a certain light fraction, this prism system, with the associated zoom section and basic lens, constituting a fourth embodiment of the invention;
  • FIG. 10 is a plan view of the embodiment of a prism system shown in FIG. 9;
  • FIG. 11 is a vertical section through a fifth embodiment of the invention.
  • FIG. 12 is a plan view of the embodiment of FIG. 11;
  • FIG. 13 is a vertical section through a sixth embodiment of the invention.
  • FIG. 14 is a horizontal section through the embodiment of FIG. 13;
  • FIG. 15 is a view, rotated through of the additional anamorphotic, afocal cylindrical lens system (in section), used in the embodiment of FIGS. 13 and 14;
  • FIG. 16 is a section similar to that of FIG. 7, through a seventh embodiment of the invention, although this figure is devoted primarily to listing the references for a worked numerical example (the references of FIG. 16 have been selected independently of those in the other figures); and
  • FIG. 17 is a scale comparison of the normal format and the anamorphotic wide-screen picture producted in accordance with the invention, the latter having been shot and projected at the same focal length and at the same distance.
  • the conventional zoom system shown in FIG. 1 consists of a zoom section 1 and a basic lens 2. Between these a diaphragm 3 for the system is arranged. Divergent lenses 4 and 5 are differentially displaced for purposes of alteration of the focal length in order, simultaneously with this alteration, to obtain a constant intercept length at a point 6 on the image.
  • the lenses 4 and 5 are shown in solid lines while in the telephoto position they are shown in broken line.
  • a collective element 7 is displaced axially.
  • the zoom system shown in FIG. 2 is equipped with a splitter device which physically splits off part of the light and directs it to a viewfinder and range-finder telescope.
  • a zoom section 8 It consists of a zoom section 8,.a basic lens 9, a diaphragm 10, a splitter prism 11, a telescope lens 12 and a field lens with a lens reversal system 13.
  • the eyepiece of the view-finder telescope has not been shown.
  • a divergent element 14 and a divergent lens I5 are displaced by different amounts in order to alter the focal length so that simultaneously with the change in focal length a constant intercept length at an image point 16 is achieved.
  • the lenses l4 and 15 are shown in full line while in the telephoto position they are shown in broken line.
  • a collective element 17 is displaced axially.
  • an anamorphotic, afocal, cylindrical lens system 21 is arranged between a zoom section 18 and a basic lens 19, and in front of a diaphragm 20, an anamorphotic, afocal, cylindrical lens system 21 is arranged.
  • the afocal cylindrical lens system 21 is effective in the vertical plane in FIG. 3 but not in the horizontal plane of FIG 4. It consists of a positive element 23 and thus in the vertical plane of FIG. 3, has a focal length extending action.
  • the resultant anamorphotic factor is between l.5 x and 2 x, as with anamorphotic auxiliary lens systems.
  • a divergent element 24 and a divergent lens 25 are displaced by different amounts in order to alter the focal length, so that simultaneously with this alteration the intercept length at an image point 26, is maintained constant.
  • the lenses 24 and 25 have been drawn in full line and in the telephoto position, in
  • a corrective element 27 is axially displaced for focussing.
  • the cylindrical lens 22 will be a divergent one and the cylindrical lens 23 a convergent one, so that a focal length shortening effect is obtained in the horizontal plane.
  • an anamorphotic prism system 31 is arranged in front of a diaphragm 30, between a zoom section 28 and a basic lens 29.
  • the anamorphotic prism system 31 is operative in the vertical plane of FIG. 5 but not in the horizontal plane of FIG. 6. It consists of an achromatic prism 32 and an achromatic prism 33 so disposed in relation to one another that in the vertical section a focal length extending action is produced.
  • the resultant anamorphotic factor lies between 1.5 x and 2 x.
  • a divergent element 34 and a divergent lens 35 are displaced by different amounts to adjust the focal length, so that simultaneously with this adjustment the intercept length at an image point 36 is maintained constant.
  • the lenses 34 and 35 are shown in full line and in the telephoto position, in broken line.
  • a collective element 37 is displaced axially.
  • the achromatic prisms 32 and 33 are so arranged that in the horizontal a focal length contracting effect is obtained, as illustrated for example in FIGS. 11 and 12.
  • FIGS. 7 and 8 show a zoom system for the third embodiment of the invention, in which between a zoom section 38 and a basic lens 39 there is an anamorphotic prims system 41.
  • the anamorphotic prism system 41 is effective in the vertical plane (FIG. 7) but not in the horizontal plane (FIG. 8).
  • achromatic prism 42 consists of an achromatic prism 42 and an achromatic prism 43 which are so disposed in relation to one another that in the vertical section a focal length extending effect occurs. Between these two prisms 42 and 43 a diaphragm 40 of the system is arranged.
  • the achromatic prism 42 here has an entry surface disposed perpendicularly to the optical axis and a cemented surface 48 disposed at 45 to the optical axis, which is partially mirrored and splits off a fraction of the light in the vertical direction, supplying it to a viewfinder and range-finder telescope of which latter the telescope lens 50, the miri'or 49 and the field lens with a lens reversal system 51, are shown.
  • the eyepiece of the view-finder telescope is not shown here.
  • the anamorphotic factor obtained by the prism system 41 lies between 1.5 x and 2x as with conventional anamorphotic auxiliary lens systems.
  • a divergent element 44 and a convergent element 45 are displaced by differential amounts in order to change the focal length, so that simultaneously with the change in focal length the intercept length is maintained constant.
  • the lenses 44 and 45 are shown full drawn and in the telephoto position in broken line.
  • a collective element 47 is displaced axially.
  • the effective plane of the anamorphotic system 41 in the horizontal.
  • the achromatic prisms 42 and 43 are so disposed that a focal length contracting effect is produced in the horizontal plane, as indicated for example in FIGS. 11 and 12.
  • the light fraction split off for the view-finder and range-finder telescope, is then taken in a horizontal direction.
  • the fourth embodiment of the invention provides an anamorphotic prism system with a simultaneous facility for splitting off a light fraction, which system consists of respective achromatic prisms 52 and 53 with an intermediate diaphragm 54, and a mirror 55 which supplies the light fraction reflected from a partially mirrored surface 56 to the prism 52 which is disposed at 45 to the optical axis, to the view-finder and range-finder telescope the components of which have not been illustrated here.
  • the entry face 57. of the prism 52 is in this case not perpendicular to the optical axis of the preceding zoom section (not shown).
  • the exit face 58 of the prism 52, for the view-finder light fraction is appropriately inclined so that that section of the achromatic prism 52 which is delimited by the faces 56, 57 and 58 and is used for the view-finder light fraction, does not introduce any reproduction error despite the inclination of the faces, because the prisms are located in a telecentric ray system which is as far as possible free from zoning.
  • the fifth embodiment of the invention is a zoom system in which, between a zoom section 59 and a basic lens 60, an anamorphotic prism system 62 is arranged.
  • the anamorphotic prism system 62 is effective in the horizontal plane (FIG. 12) but not in the vertical plane (FIG. 11).
  • It consists of an achromatic prism 63 and an achromatic prism 64 so disposed in relation to one another that in the horizontal section a focal length contracting effect is produced.
  • a diaphragm 61 of the system is arranged.
  • the achromatic prism 63 here has an entry face 69 disposed at 45 to the optical axis, this face being partially mirrored and splitting off a fraction of the entering light in a horizontal direction via a mirror 70 to a view-finder and range-finder telescope, (not shown).
  • the anamorphotic factor determined by the prism system 62 is between 1.5 x and 2 x as in the case of conventional auxiliary lens systems.
  • FIGS. 13 to 15 The sixth embodiment is illustrated in FIGS. 13 to 15.
  • a zoom system is equipped, between a zoom section 71 and a basic lens 72, and in front of a diaphragm 73, with an anamorphotic afocal cylindrical lens system 74.
  • the anamorphotic cylindrical lens system 74 is effective in the vertical section of FIG. 13 but not in the horizontal section of FIG. 14. It consists here of a cemented convergent cylindrical lens 75 and a cemented divergent cylindrical lens 76, and here has a focal length extending effect.
  • a plane-parallel glass plate 77 arranged at 45, one surface of which is partially mirrored and which splits off a fraction of the light in the horizontal direction, to a view-finder and range-finder telescope.
  • This ray system which in the vertical plane and because of the presence of the cemented convergent cylindrical lens 75, has become convergent, becomes telecentric again in this plane because of the presence of a divergent cylindrical lens 78 which is optically identical with the divergent cylindrical lens 76.
  • a spherical lens 79 via a mirror 80 and field lens 81, reproduces the now anamorphotic image in the plane of a field of view diaphragm 82.
  • This anamorphotic picture is reproduced again at infinity, via a spherical lens reversal system section 83.
  • afocal cylindrical lens system 85 produces the same measure of focal length contraction as the focal length extension produced by the cylindrical lens system 74.
  • FIG. illustrates a view of this cylindrical lens system 85, in section and rotated through 90 about the axis.
  • the half section 84 of the lens reversal system here again produces an undistorted view finder image which can be viewed through an eyepiece (not shown).
  • FIG. 16 illustrates a vertical section in which the designations used for the numerical example are marked.
  • the light fraction split off for the view-finder and range-finder telescope is here taken in a vertical direction at 90 to the axis.
  • the anamorphotic prism system is likewise effective in the vertical plane and has a focal length extending factor of 1.5 x.
  • the numerical example is distinguished by very small zone areas at all angular fields.
  • angles 16 to 21 are the angles of inclination of the faces of the prisms P to P measured between the normal to the particular face and the optical axis in the vertical section.
  • the effective angular field of the basic lens is 10.
  • a variable focal length cinecamera system comprising an afocal auxiliary lens system having a plurality of optical elements capable of being moved relative to each other to change the focal length of said lens system, the intercept length being maintained constant, a succeeding permanently installed basic lens focused at infinity, a camera diaphragm arranged between said afocal auxiliary lens system and said basic lens, and an afocal anamorphotic system located between said afocal auxiliary lens system and said basic lens adjacent said diaphragm, said diaphragm being arranged at a point in the optical system where the cross section of the imaging ray bundle is at a minimum whereby the size of said anamorphotic system can be minimized.
  • a variable focal length cinecamera system comprising an afocal auxiliary lens system having a plurality of optical elements capable of being moved relative to each other to change the focal length of said lens system, the intercept length being maintained constant, a succeeding permanently installed basic lens focused at infinity, an afocal anamorphotic system-consisting of at least two achromatic prisms located between said afocal auxiliary lens system and said basic lens, and a viewfinder telescope, a face of one of said prisms being used to split off part of the light traveling through said system to enable the view-finder image to be observed through said view-finder telescope.
  • a variable focal length cinecamera system comprising an afocal auxiliary lens system having a plurality of optical elements capable of being moved relative to each other to change the focal length of said lens system, the intercept length being maintained constant, a succeeding permanently installed basic lens focused at infinity, an afocal anarmophotic system located between said afocal auxiliary lens system and said basic lens, a view-finder telescope, and a partially mirrored face within said afocal anamorphotic system, said partially mirrored face serving to split off part of the light traveling through said system to enable the view-finder image to be observed through said view-finder telescope.
  • a cinecamera system as claimed in claim 3 in which said anamorphotic system comprises at least two cylindrical lenses and a partially reflective mirror arranged between said lenses, said mirror serving to split off the light for the view-finder image which is observed through said view finder telescope.

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US00175513A 1970-09-01 1971-08-27 Variable focal length anamorphotic cinecamera systems Expired - Lifetime US3751136A (en)

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DE2043193A DE2043193C3 (de) 1970-09-01 1970-09-01 Anamorphotisches Aufnahmeobjektiv mit veränderbarer Brennweite

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885862A (en) * 1972-10-09 1975-05-27 Yashica Co Ltd Zoom lens
US3924933A (en) * 1972-11-17 1975-12-09 Canon Kk Anamorphotic lens system
US3989349A (en) * 1973-02-06 1976-11-02 Karl Vockenhuber Reflex finder
US3990785A (en) * 1972-09-22 1976-11-09 Canon Kabushiki Kaisha Anamorphic zoom lens
US4015895A (en) * 1973-01-18 1977-04-05 Canon Kabushiki Kaisha Zoom lens system having enlarged range of variation in magnification
US4240697A (en) * 1975-06-05 1980-12-23 Canon Kabushiki Kaisha Lens system having selectively shiftable focal length
US4460251A (en) * 1979-07-28 1984-07-17 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens focusing system
WO1986000009A1 (fr) * 1984-06-07 1986-01-03 Mull Guenter Dispositif pour donner une image sans distorsion d'un objet situe dans le plan de l'image
US4730199A (en) * 1984-11-09 1988-03-08 Canon Kabushiki Kaisha Photographic apparatus
US5061054A (en) * 1988-03-15 1991-10-29 Nikon Corporation Keplerian finder optical system
US5097360A (en) * 1988-10-07 1992-03-17 Canon Kabushiki Kaisha Zoom lens capable of changing a range of variable focal length
US5648871A (en) * 1991-06-28 1997-07-15 Canon Kabushiki Kaisha Projection apparatus utilizing an anamorphic optical system
US5668666A (en) * 1995-01-05 1997-09-16 Nikon Corporation Zoom lens with an anamorphic converter
US5930050A (en) * 1997-10-21 1999-07-27 Texas Instruments Incorporated Anamorphic lens for providing wide-screen images generated by a spatial light modulator
US6307683B1 (en) * 1999-03-25 2001-10-23 Fuji Photo Optical Co., Ltd Zoom lens
US6556791B1 (en) * 1999-12-21 2003-04-29 Eastman Kodak Company Dual channel optical imaging system
US6618560B2 (en) * 2000-05-31 2003-09-09 Pentax Corporation Focus detection device
US20050168829A1 (en) * 2004-02-04 2005-08-04 Canon Kabushiki Kaisha Anamorphic converter, lens device using the same, and image-taking device using the same
US20050225876A1 (en) * 2004-04-12 2005-10-13 Canon Kabushiki Kaisha Anamorphic converter, lens system, and shooting system
US20050285963A1 (en) * 2004-06-09 2005-12-29 Fuji Photo Film Co., Ltd. Digital camera having flexible display unit
GB2430272A (en) * 2005-09-16 2007-03-21 Raytheon Co Optical system having an anamorphic lens
US20110199586A1 (en) * 2010-02-12 2011-08-18 Seiko Epson Corporation Projector and anamorphic prism optical unit
CN104360460A (zh) * 2014-12-01 2015-02-18 东莞市奥普特自动化科技有限公司 8mm定焦机器视觉镜头

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2231411B (en) * 1989-02-08 1993-07-07 Robert Campbell Cameras
DE102014005789B4 (de) 2014-04-16 2017-08-03 Technische Universität Ilmenau Anamorphotisches System und seine Verwendung

Citations (5)

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US2048284A (en) * 1933-10-23 1936-07-21 Harry S Newcomer Variable focus correcting lens
US2798411A (en) * 1954-04-12 1957-07-09 Taylor Taylor & Hobson Ltd Two member anamorphotic prism systems having their operative planes at right angles and axial deviation directions parallel
US3015988A (en) * 1955-11-25 1962-01-09 Gen Precision Inc Perspective alteration means
US3451743A (en) * 1964-12-28 1969-06-24 Schneider Co Optische Werke Optically compensated varifocal objective
GB1203479A (en) * 1967-05-22 1970-08-26 Kurt Kirchhoff Improvements in or relating to optical apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048284A (en) * 1933-10-23 1936-07-21 Harry S Newcomer Variable focus correcting lens
US2798411A (en) * 1954-04-12 1957-07-09 Taylor Taylor & Hobson Ltd Two member anamorphotic prism systems having their operative planes at right angles and axial deviation directions parallel
US3015988A (en) * 1955-11-25 1962-01-09 Gen Precision Inc Perspective alteration means
US3451743A (en) * 1964-12-28 1969-06-24 Schneider Co Optische Werke Optically compensated varifocal objective
GB1203479A (en) * 1967-05-22 1970-08-26 Kurt Kirchhoff Improvements in or relating to optical apparatus

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990785A (en) * 1972-09-22 1976-11-09 Canon Kabushiki Kaisha Anamorphic zoom lens
US3885862A (en) * 1972-10-09 1975-05-27 Yashica Co Ltd Zoom lens
US3924933A (en) * 1972-11-17 1975-12-09 Canon Kk Anamorphotic lens system
US4015895A (en) * 1973-01-18 1977-04-05 Canon Kabushiki Kaisha Zoom lens system having enlarged range of variation in magnification
US3989349A (en) * 1973-02-06 1976-11-02 Karl Vockenhuber Reflex finder
US4240697A (en) * 1975-06-05 1980-12-23 Canon Kabushiki Kaisha Lens system having selectively shiftable focal length
US4460251A (en) * 1979-07-28 1984-07-17 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens focusing system
WO1986000009A1 (fr) * 1984-06-07 1986-01-03 Mull Guenter Dispositif pour donner une image sans distorsion d'un objet situe dans le plan de l'image
US4730199A (en) * 1984-11-09 1988-03-08 Canon Kabushiki Kaisha Photographic apparatus
US5061054A (en) * 1988-03-15 1991-10-29 Nikon Corporation Keplerian finder optical system
US5097360A (en) * 1988-10-07 1992-03-17 Canon Kabushiki Kaisha Zoom lens capable of changing a range of variable focal length
US5648871A (en) * 1991-06-28 1997-07-15 Canon Kabushiki Kaisha Projection apparatus utilizing an anamorphic optical system
US5668666A (en) * 1995-01-05 1997-09-16 Nikon Corporation Zoom lens with an anamorphic converter
US5930050A (en) * 1997-10-21 1999-07-27 Texas Instruments Incorporated Anamorphic lens for providing wide-screen images generated by a spatial light modulator
US6307683B1 (en) * 1999-03-25 2001-10-23 Fuji Photo Optical Co., Ltd Zoom lens
US6556791B1 (en) * 1999-12-21 2003-04-29 Eastman Kodak Company Dual channel optical imaging system
US6618560B2 (en) * 2000-05-31 2003-09-09 Pentax Corporation Focus detection device
US7113344B2 (en) 2004-02-04 2006-09-26 Canon Kabushiki Kaisha Anamorphic converter, lens device using the same, and image-taking device using the same
EP1566681A1 (en) * 2004-02-04 2005-08-24 Canon Kabushiki Kaisha Anamorphic converter, lens device using the same, and image-taking device using the same
US20050168829A1 (en) * 2004-02-04 2005-08-04 Canon Kabushiki Kaisha Anamorphic converter, lens device using the same, and image-taking device using the same
US20050225876A1 (en) * 2004-04-12 2005-10-13 Canon Kabushiki Kaisha Anamorphic converter, lens system, and shooting system
EP1586929A1 (en) * 2004-04-12 2005-10-19 Canon Kabushiki Kaisha Anamorphic converter
US20050285963A1 (en) * 2004-06-09 2005-12-29 Fuji Photo Film Co., Ltd. Digital camera having flexible display unit
GB2430272A (en) * 2005-09-16 2007-03-21 Raytheon Co Optical system having an anamorphic lens
US20110199586A1 (en) * 2010-02-12 2011-08-18 Seiko Epson Corporation Projector and anamorphic prism optical unit
US8827463B2 (en) * 2010-02-12 2014-09-09 Seiko Epson Corporation Projector and anamorphic prism optical unit
CN104360460A (zh) * 2014-12-01 2015-02-18 东莞市奥普特自动化科技有限公司 8mm定焦机器视觉镜头

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DE2043193C3 (de) 1980-10-30
DE2043193A1 (de) 1972-03-09
DE2043193B2 (enExample) 1980-02-28

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