Catalogue des appareils cinématographiques de la Cinémathèque française et du CNC

Type de l'appareil

cellule photovoltaïque au silicon ; objectif ; viseur à prisme ; cadran donnant la luminance en footlamberts (de 0,5 à 300) ou candelas/meter et la batterie ; amplificateur électronique ; emplacement pour piles ; dragonne ; valise de transport avec poignée

Auteurs

Informations non disponibles

Fabricants

Spectra Cine Inc.
Burbank, 820 Hollywood Way, California

Utilisateurs

Informations non disponibles

Distributeurs

Spectra Cine Inc.
Burbank, 820 Hollywood Way, California

Sujet du modèle

Informations non disponibles

Objectif

4 cm diamètre

Taille de l'objet

Ouvert :
Informations non disponibles

Fermé :
Longueur : 13 cm
Largeur : 5.5 cm
Hauteur : 16.5 cm

Diamètre :
Informations non disponibles

Taille de la boîte de transport

Longueur : 24 cm
Largeur : 33 cm
Hauteur : 14 cm

Remarques

Marques : "Spectra CineSpot 1° Spotmeter, Spectra Cine Inc., Burbank, Calif. U. S. A." ; "Spectra Cine Inc. Burbank, Calif. n° 490".

"The Spectra CineSpot 1 Degree Spotmeter is a compact hand-held photometer that is ideally suited for field use. It has see-through optics, and the meter reading is displayed simultaneously in the viewing field. The CineSpot also features a computer-selected filter (to match the human eye response) and an ultra-stable silicon photodetector for maximum accuracy and repeatability. The heart of any light measuring instrument is the photodetector. The CineSpot incorporates an ultra-stable, drift-free silicon cell photodetector in conjunction with the latest solid-state amplifiers for the utmost in accuracy, repeatability and freedon from hysteresis and fatigue. The Spectra CineSpot optical system consists of an objective lens, a viewing system, a silicon photocell, and an internally visible meter and meter scale. The objective lens focuses an image of the subject inside the instrument. An internal beam-splitter divides the focused light beam into two halves ; one half is focused on the silicon cell while the other half is focused on a circular reticle in the center of the viewfinder. This reticle is called the "1° measurung field circle", and is factory adjusted to coincide exactly with the silicon cell so that the circle visible in the viewfinder scale and the meter pointer are also illuminated bu the second portion of the light beam, and are simultaneously visible in the viewfinder. The viewfinder consist of a prism and 1.6-power viewing eyepiece which can be focused to accomodate the varying eyesight of different users. The eyepiece is focused by turning the knurled ring until the internal meter scale (not the external subject) is in sharp focus for your eye. One adjusted for your eye, refocusing of the eyepiece should not be required unless the focus setting is disturbed. The objective lens (the large lens that points toward the subject) is factory adjusted for optimal focus for all subject distance from 4 feet (1.2 meters) to infinity. If it is absolutely necessary, subjects as close as 1 foot (0.3 m) can be measured, but it will be necessary to apply a correction factor to the meter reading. [...] The electronics in the CineSpot is all solid state for utmost compactness and reliability. The amplifier is an intergrated-circuit operational amplifier, used in the "short-circuit-input current mode" for optimum stability and linearity of the silicon photocell. Power for the electronics is supplied by a single, commonly available 6 volt battery" (Instruction Manual for the Spectra CineSpot 1 Degree Spotmeter, Burbank, Spectra Cine, Inc., s.d.).

Bibliographie

Instruction Manual for the Spectra CineSpot 1 Degree Spotmeter, Burbank, Spectra Cine, Inc., s.d.