Mark A. Cella is a distinguished fellow of film studies at California State University in Los Angeles. He’s a published writer on Cinema History and Film Theory. He has directed over 35 shorts and documentaries, including the award winning “Marlboro House”, which took top prize at the 2006 Slamdance short competition.
Today: Film Speed - The sensitivity to light for proper exposure of a given film stock. This is primarily a result of the size of the silver halides in the emulsion, the larger the grain, the less light is needed for exposure. Film stocks are generally spoken of as being fast or slow, a fast film having large grains and needing less light, a slow film having smaller grain and needing more light.
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