Information: Illumination Required for Correct Exposure Guide

Illumination Required for Correct Exposure Guide

Illumination Required (in Footcandles) for Correct Exposure at 1/50 Second
Exposure Index	T1.4	T2	T2.8	T4	T5.6	T8	T11	T16
25	100	200	400	800	1600	3200	6400	12800
40	62.5	125	250	500	1000	2000	4000	8000
64	40	80	160	320	640	1280	2560	5120
100	25	50	100	200	400	800	1600	3200
125	20	40	80	160	320	640	1280	2560
160	16	32	64	128	256	512	1024	2048
200	12.5	25	50	100	200	400	800	1600
250	10	20	40	80	160	320	640	1280
320	8	16	32	64	128	256	512	1024
400	6.25	12.5	25	50	100	200	400	800
500	5	10	20	40	80	160	320	640
NOTE: Film Tests Should be Used to Verify Results