FR901491A - Photoelectric light meter that can be inserted in an observation light beam - Google Patents

Photoelectric light meter that can be inserted in an observation light beam

Info

Publication number
FR901491A
FR901491A FR901491DA FR901491A FR 901491 A FR901491 A FR 901491A FR 901491D A FR901491D A FR 901491DA FR 901491 A FR901491 A FR 901491A
Authority
FR
France
Prior art keywords
photoelectric
light beam
meter
observation
light
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.)
Expired
Application number
Other languages
French (fr)
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.)
Zeiss Ikon AG
Original Assignee
Zeiss Ikon AG
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 Zeiss Ikon AG filed Critical Zeiss Ikon AG
Application granted granted Critical
Publication of FR901491A publication Critical patent/FR901491A/en
Expired 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
    • 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
    • G03B7/09971—Through the lens [TTL] measuring in mirror-reflex cameras
    • G03B7/09973—Through the lens [TTL] measuring in mirror-reflex cameras using the mirror as sensor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR901491D 1943-03-17 1944-01-24 Photoelectric light meter that can be inserted in an observation light beam Expired FR901491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE901491X 1943-03-17

Publications (1)

Publication Number Publication Date
FR901491A true FR901491A (en) 1945-07-27

Family

ID=6858835

Family Applications (1)

Application Number Title Priority Date Filing Date
FR901491D Expired FR901491A (en) 1943-03-17 1944-01-24 Photoelectric light meter that can be inserted in an observation light beam

Country Status (1)

Country Link
FR (1) FR901491A (en)

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