Society of Motion Picture Engineers : incorporation and by-laws (1922)

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2.1 QNC COAT 1 VEPS M ZA ^ -^ 2J / tJ / 1.2 / / .9 / / .6 / / .3 . / ■ / "y^ 2.2 2.5 S.8 T.I Tx T.7 0.0 0.3 a« LOO E Fig. 10 — Characteristic Curve for Cine Negative Film. The following relations between these constant found Nx (min.) = Z.Bo (min.) Nx (min.) .t = E^ (min.) = t . Bo (min.) .Z T^ f ' \ Ex (min.) Bo (mm.) = "" ^ ^ (12) (13) (14) This equation is based on the assumption that the object on which the minimum brightness is measured is non-selective in its reflection characteristics. It further assumes that there is no selectively absorbing material between the light source and the object illuminated or between the object and the taking camera. No account is taken in this formula of the relative photic efficiency of the illuminant, it being assumed that the quality of a light used in the 7.7 PA ICHR( MATI C FIL M ! 74 / 7 1 /^ 18 ■ / > / / u / / A / .A / 1 / i V 1 1 2.2 2.5 2.8 1.1 \A 1.7 Oi) 0L3 0,6 Fig. 11 — Characteristic Curve for Cine Panchromatic Film. 93