GETTING THE RIGHT AMOUNT OF LIGHT TO MAKE THE PICTURE

Understanding Exposure

The Photographic Triangle

Aperture

Film SpeedShutter Speed

Photography’s creative tools include:

Photographer must decide which one takes priority.

Aperturemost important for depth of field Shutter Speedmost important for action – show motion or

stop action Film Speedspeed used allows for different aperture/speed

combinations to provide a variety of creative effects

The Photographic Triangle

Which element you choose as a priority will be the most important decision you make before taking a photograph.

The Photographic Triangle

next

Choice of film speed affects the ability to achieve creative effects with aperture and shutter speed Commonly measured using ISO number

25, 50, 64, 100, 200, 400, 800, 1600each is twice as sensitive to light as the previous

Film Speed

Speed of film determines its sensitivity to light Slow speed (ISO 25, 50, 64)

less sensitive to lightgood for daylightdepending on the light, may require longer

exposure times/larger apertures

 Fast speed (ISO 400+)more sensitive to lightgood for night, indoors/low lightdepending on the light, can use shorter

exposure times/smaller apertures

Film Speed

Speeds

Slow Medium Fast

ISO 25, 50, 64 100, 200 400, 800, 1600

Exposure time(depending on the light)

long medium short

Graininess lacks grain some grain grainy

Quality rich color, sharp vivid images

rich color, acceptable sharpness

colors less vivid, lacks good detail

For close-ups, landscapes

people, landscapes hand held action, lowlight

Tripod required sometimes seldom

Film Speed