Glossary
 

Glossary

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Glossary > Film Speed  
The arithmetic measurement of a film's sensitivity to light. Usually given in ISO i.e. 400 ISO film is eight times more sensitive to light than 50 ISO. Higher film speed tends to be used for darker situations or when a faster shutter speed is required (e.g 400 ISO is ideal for indoor shots or where light is poor, 100 ISO is ideal for use in bright sunlight).