FR888782A - Instrument for determining the exposure time for enlargements or photographic reproductions - Google Patents

Instrument for determining the exposure time for enlargements or photographic reproductions

Info

Publication number
FR888782A
FR888782A FR888782DA FR888782A FR 888782 A FR888782 A FR 888782A FR 888782D A FR888782D A FR 888782DA FR 888782 A FR888782 A FR 888782A
Authority
FR
France
Prior art keywords
enlargements
instrument
determining
exposure time
photographic reproductions
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
Ferdinand Fuchs
Hans Weidmann
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 FR888782A publication Critical patent/FR888782A/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
    • G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
    • G01J1/122—Visual exposure meters for determining the exposure time in photographical recording or reproducing
    • G01J1/124—Visual exposure meters for determining the exposure time in photographical recording or reproducing based on the comparison of the intensity of measured light with a comparison source or comparison illuminated surface

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR888782D 1941-12-05 1942-12-04 Instrument for determining the exposure time for enlargements or photographic reproductions Expired FR888782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH888782X 1941-12-05

Publications (1)

Publication Number Publication Date
FR888782A true FR888782A (en) 1943-12-22

Family

ID=4545515

Family Applications (1)

Application Number Title Priority Date Filing Date
FR888782D Expired FR888782A (en) 1941-12-05 1942-12-04 Instrument for determining the exposure time for enlargements or photographic reproductions

Country Status (1)

Country Link
FR (1) FR888782A (en)

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