FR760136A - Photometer for determining the exposure time when taking photographs - Google Patents

Photometer for determining the exposure time when taking photographs

Info

Publication number
FR760136A
FR760136A FR760136DA FR760136A FR 760136 A FR760136 A FR 760136A FR 760136D A FR760136D A FR 760136DA FR 760136 A FR760136 A FR 760136A
Authority
FR
France
Prior art keywords
photometer
determining
exposure time
taking photographs
photographs
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)
Inventor
Max Helfenstein
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 filed Critical
Application granted granted Critical
Publication of FR760136A publication Critical patent/FR760136A/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)
  • Eye Examination Apparatus (AREA)
FR760136D 1932-08-31 1933-08-28 Photometer for determining the exposure time when taking photographs Expired FR760136A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH133041D DE630291C (en) 1932-08-31 1932-08-31 Light meter

Publications (1)

Publication Number Publication Date
FR760136A true FR760136A (en) 1934-02-16

Family

ID=7176766

Family Applications (1)

Application Number Title Priority Date Filing Date
FR760136D Expired FR760136A (en) 1932-08-31 1933-08-28 Photometer for determining the exposure time when taking photographs

Country Status (2)

Country Link
DE (1) DE630291C (en)
FR (1) FR760136A (en)

Also Published As

Publication number Publication date
DE630291C (en) 1936-05-25

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