EP0145743A1 - Installation de commande de l'eclairage par flash en macrophotographie - Google Patents

Installation de commande de l'eclairage par flash en macrophotographie

Info

Publication number
EP0145743A1
EP0145743A1 EP84902192A EP84902192A EP0145743A1 EP 0145743 A1 EP0145743 A1 EP 0145743A1 EP 84902192 A EP84902192 A EP 84902192A EP 84902192 A EP84902192 A EP 84902192A EP 0145743 A1 EP0145743 A1 EP 0145743A1
Authority
EP
European Patent Office
Prior art keywords
macro
flash
photosensitive element
light
camera
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.)
Withdrawn
Application number
EP84902192A
Other languages
German (de)
English (en)
Inventor
Christo Obreschkow
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0145743A1 publication Critical patent/EP0145743A1/fr
Withdrawn legal-status Critical Current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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • 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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/099—Arrangement of photoelectric elements in or on the camera
    • G03B7/0993—Arrangement of photoelectric elements in or on the camera in the camera
    • G03B7/0997—Through the lens [TTL] measuring
    • 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
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • 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
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0514—Separate unit

Definitions

  • the invention relates to a device for controlling the exposure of objects in macro shots, consisting of at least one electronic flash device and at least one photosensitive element which controls this flash device.
  • Macro photography is a problem area of. fundamental importance, namely the mutual relationship between the object illumination and the extremely significant depth of field.
  • the depth of field depends to a certain extent on the aperture opening, but on the other hand it also depends on the object distance, which object distance is limited to the macro range in macro photography and as a result of which the depth of field is subjected to the same limitation.
  • Shallow depth of field creates not only in depth, but also peripherally blurred images with a striking loss of detail, and it can be viewed in a transferred way can be said that the photographic quality in macro photography is directly proportional to the (achieved) depth of field. This applies to most applications.
  • the depth of field is fundamentally limited by the geometry of the optics and the selected object distance. As the variable size influencing the depth of field within the optical system, only the aperture is responsible. In the case of flash photography, this aperture is ultimately dependent on the sensitivity of the film material and the intensity of the object light.
  • Photographic equipment for macro photography only meets these and the following requirements to a limited extent.
  • special brackets made it possible to arrange artificial light sources, lamps, electron flashes, etc. directly next to the front lens of the lens in order to at least avoid camera and lens shadows on the illuminated object. Since the required angle of incidence depends on the photographic working distance and the position of the light source in turn influences the intensity of the object light, working in the macro range requires constant adjustment of the light source. Since the aperture is empirically set due to a lack of measurement options, the quality of the photographic results with such combinations of apparatuses for obtaining macro pictures is quite inconsistent.
  • ring flash tubes were created, for example, which lens of the lens.
  • a new disadvantage of the same is obvious: Although very reliable, reproducible exposures can be achieved with ring flash units, the surface structure is leveled by the 360-degree shadow and thus loses detailed information.
  • the light intensities that can be achieved with ring flash units are relatively weak, which requires a larger aperture, which immediately reduces the depth of field.
  • Such film plane measurements are known in connection with various photo systems in which the film plane is photo-sensor-monitored for preconditioning the exposure control and for correcting the exposure time (for example) during the exposure process. With this control system it is possible to reproduce the photon energy integral quite well, regardless of the angle of incidence, type of lighting, optical systems, etc.
  • the task is solved in that a photosensitive element in the edge region of the beam path between the imaging optics of a macro system and the image plane of a camera is arranged so that it can be removed from the camera and can be electrically connected to a flash unit.
  • FIG. 1 shows a macro-photographic arrangement with the device according to the invention
  • FIG. 2 shows a functional detail in connection with the macrophotographic light measurement
  • FIG. 1 an optical axis 9 running through the optical system for the macro system 2, 3, a second optical axis 15 'inclined to the first for the illumination source 15, that is to say the flash unit, and a third optical axis likewise inclined to the first Axis 5 'for a photosensitive measuring element 5 in the macro converter 2.
  • an object 13 with an object relief 13' to be imaged which object relief lies in the light cone 17 of the lighting or flashing device 15 is illuminated by a luminous flux A.
  • the lighting device is, for example, an electronically controllable flash unit and, for the sake of simplicity, is only functionally represented by a flash window 20 in a black box 15.
  • An electrical connection 1 serves to transmit the measured value from the macro converter 2 or its photosensitive element 5.
  • the light AR reflected by the object relief arrives along the optical axis 9 of the macro system through the lens group 3 'of the objective 3 and the lens group 2' of the macro converter 2 onto the film plane 7 in the camera 1. That which runs along the optical axis 5 'of the photosensitive element 5 "Light AR 'reflected from the film plane is measured by this photosensitive element 5 and the measured value is processed in a circuit associated with a photodiode but not shown, for example, and supplied to the flash electronics (also not shown) via electrical connection 14. This measured value determines the duration of the electronic additional light to the existing object light, ie it completes the required proportion of the exposure energy.
  • the optimal angle ⁇ between the optical axis 9 of the macro system and the optical axis 5 of the photosensitive element is determined empirically, the angle ⁇ between the optical axis 9 of the macro system and the optical axis 15 'of the flash device is arbitrary, for example solely on the imaging requirements or related to the spatial possibilities, selectable.
  • FIG. 2 now shows a problem which has already been indicated at the beginning, namely the macro shot with computer flashes and the associated parallax problem.
  • a light source here again a flash device 15 with a flash window 23 and a permanently installed light sensor 5, illuminates the relief 13 'of an object 13 within the light cone 17.
  • the optical axis 15' of the flash light source stands at the desired illumination angle to the object, from which a number of arrows are shown, diffuse light is emitted after several instant.
  • a part Am of this light strikes the light sensor 5, another part AR finally falls as object light via the lens 3 onto the film plane 7.
  • the reflected light in the direction Am and the reflected light in the direction AR differ more strongly, the larger the with ⁇ designated angle between the optical axes 5 'of the photosensor and 9 of the macro optics.
  • the macro photo device thus consists of a commercially available camera with an interchangeable lens and an electronically controllable flash unit that is tailored to the macro range.
  • the macro system equipped in accordance with the invention has the commercially available bayonet and screw couplings and is equipped with the indispensable automatic aperture control.
  • the macro range typically extends from 1:10 to 1: 1 without changing the overall length, whereby this overall length is also extremely short.
  • the entire working area of the optical system can 1: up to 1: 1.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

L'installation comporte un macrosystème (2, 3) coopérant avec un appareil photographique (1), formé de préférence d'un macroconvertisseur (2) et d'un objectif normal (3), macrosystème dans lequel est prévu un élément photosensible (5) dirigé vers le plan du film (7) afin de commander un flash (15) prévu à cet effet et synchronisé de manière correspondante. L'élément photosensible mesure la lumière objet (Ar') réfléchie par le plan du film avec un angle beta déterminé, alors que le flash commandé peut être disposé dans l'angle d'ombre alpha désiré. Grâce à cela, un petit investissement technique amène un appareil photographique à objectif interchangeable que l'on trouve sur le marché au stade le plus moderne de la technique macrophotographique.
EP84902192A 1983-06-16 1984-06-12 Installation de commande de l'eclairage par flash en macrophotographie Withdrawn EP0145743A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH331283 1983-06-16
CH3312/83 1983-06-16

Publications (1)

Publication Number Publication Date
EP0145743A1 true EP0145743A1 (fr) 1985-06-26

Family

ID=4253263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84902192A Withdrawn EP0145743A1 (fr) 1983-06-16 1984-06-12 Installation de commande de l'eclairage par flash en macrophotographie

Country Status (2)

Country Link
EP (1) EP0145743A1 (fr)
WO (1) WO1985000062A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2650680B1 (fr) * 1989-08-02 1993-07-02 Asahi Optical Co Ltd Dispositif de flash d'appareil photographique
US5305037A (en) * 1989-08-02 1994-04-19 Asahi Kogaku Kogyo Kabushiki Kaisha Strobe device of camera
DE4210609A1 (de) * 1992-03-31 1993-10-07 Storz Karl Gmbh & Co Anordnung zum Aufnehmen von photographischen Bildern in einem Hohlraum
FR2796472B1 (fr) * 1999-07-13 2001-10-19 Eric Thery Dispositif pour la macrophotographie de traces papillaires latentes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107706A (en) * 1970-12-19 1978-08-15 Minolta Camera Kabushiki Kaisha Camera apparatus
DE2642748A1 (de) * 1976-09-23 1978-03-30 Braun Ag Messvorrichtung zur lichtmessung zwecks steuerung von elektronenblitzgeraeten fuer fotografische aufnahmen
IT1212476B (it) * 1981-01-15 1989-11-22 Giovanni Repetti Dispositivo accessorio per la misura ed il controllo della esposizione in campo fotografico.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8500062A1 *

Also Published As

Publication number Publication date
WO1985000062A1 (fr) 1985-01-03

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19850521