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Calculator for Film Speed / ISO Sensivitiy

Calculate here with the details of luminance, effective aperture and shutter speed, ISO sensitivity.

Luminance		cd/m²
effective Aperture
Shutter Speed		Seconds
Result		ISO-Sensitivity

Used Formulas:

H = (b ⋅ L ⋅ t) ÷ N²
The factor b = 0.650 arises from the physical properties of the lens (lens transmission, vignetting and stray light factor), an object distance of 80 times the focal length and an angle of 12 ° from the lens axis (ISO measurement protocols)

Convert film speed

Here you can calculate between the different sensitivity units.

ISO-Value	ISO (Format: WXY(Z)/AB, e.g.: 100/20)
ASA-Value	ASA
DIN-Value	° DIN
GOST-Value	GOST

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Alle Berechnungen wurden mit großer Sorgfalt erstellt, eine Haftung auf Korrektheit des Ergebnisses wird dennoch ausgeschlossen.