FR557005A - Device indicating, for different darkroom prints, the reduced value of the light intensity of the apertures of a photographic lens and various other factors - Google Patents

Device indicating, for different darkroom prints, the reduced value of the light intensity of the apertures of a photographic lens and various other factors

Info

Publication number
FR557005A
FR557005A FR557005DA FR557005A FR 557005 A FR557005 A FR 557005A FR 557005D A FR557005D A FR 557005DA FR 557005 A FR557005 A FR 557005A
Authority
FR
France
Prior art keywords
darkroom
prints
apertures
factors
various
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
William George Rickman
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 FR557005A publication Critical patent/FR557005A/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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR557005D 1922-10-04 1922-10-04 Device indicating, for different darkroom prints, the reduced value of the light intensity of the apertures of a photographic lens and various other factors Expired FR557005A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR557005T 1922-10-04

Publications (1)

Publication Number Publication Date
FR557005A true FR557005A (en) 1923-08-01

Family

ID=8940552

Family Applications (1)

Application Number Title Priority Date Filing Date
FR557005D Expired FR557005A (en) 1922-10-04 1922-10-04 Device indicating, for different darkroom prints, the reduced value of the light intensity of the apertures of a photographic lens and various other factors

Country Status (1)

Country Link
FR (1) FR557005A (en)

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