FR837784A - Photographic light meter incorporating a comparison light source - Google Patents

Photographic light meter incorporating a comparison light source

Info

Publication number
FR837784A
FR837784A FR837784DA FR837784A FR 837784 A FR837784 A FR 837784A FR 837784D A FR837784D A FR 837784DA FR 837784 A FR837784 A FR 837784A
Authority
FR
France
Prior art keywords
light source
comparison
meter incorporating
photographic
photographic 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.)
Ernst Leitz Wetzlar GmbH
Original Assignee
Ernst Leitz Wetzlar GmbH
Ernst Leitz GmbH
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 Ernst Leitz Wetzlar GmbH, Ernst Leitz GmbH filed Critical Ernst Leitz Wetzlar GmbH
Application granted granted Critical
Publication of FR837784A publication Critical patent/FR837784A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR837784D 1937-07-06 1938-05-10 Photographic light meter incorporating a comparison light source Expired FR837784A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE837784X 1937-07-06

Publications (1)

Publication Number Publication Date
FR837784A true FR837784A (en) 1939-02-20

Family

ID=6761513

Family Applications (1)

Application Number Title Priority Date Filing Date
FR837784D Expired FR837784A (en) 1937-07-06 1938-05-10 Photographic light meter incorporating a comparison light source

Country Status (1)

Country Link
FR (1) FR837784A (en)

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