Film Speed ISO Guide
ISO (or ASA) measures a film's or sensor's sensitivity to light. Higher ISO means more sensitivity but coarser grain. Select a common speed or enter any value.
ISO 25
Extremely fine
ISO 50
Ultra fine
ISO 100
Fine grain
ISO 200
Versatile
ISO 400
All-purpose
ISO 800
Low light
ISO 1600
Very fast
ISO 3200
Extreme grain
Grain / Noise Level
Light Requirement
Best For
Equivalent Exposure