The Three Elements of Exposure Understanding f/stop, shutter speed, and ISO.

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Presentation transcript:

The Three Elements of Exposure Understanding f/stop, shutter speed, and ISO

What is exposure? Definition 1: the amount of light it takes to produce a printable image on the negative (film) Definition 2: the actual taking of the photo

Understanding exposure ISO Aperture (f/stop) Shutter speedExposure

Negative and Positive

Exposure Factor 1: ISO ISO Aperture (f/stop) Shutter speed

Exposure Factor 1: ISO International Standard Organization Measures film speed What is film speed?

Film speed is not…

Film speed is…. The sensitivity of the film to light.

Film Speed, cont’d The higher the ISO number, the more sensitive the film is to light. ISO 50ISO 100ISO 200ISO 400ISO 800ISO 1600 ISO 3200 ISO 6400 SlowMedium Fast Ultrafast Needs more light *this is the film speed we use Needs less light

Film Speed, cont’d Film speed also determines grain. ISO 50ISO 100ISO 200ISO 400ISO 800ISO 1600 ISO 3200 ISO 6400 SlowMedium Fast Ultrafast Fine grain Medium grain Coarse grain

Film speed, cont’d Fine grain Coarse grain

How do you manipulate film speed?

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