Digital Photography 1 - Quiz 1

What is Exposure?

The amount of light that contacts the sensor which directly correlates with lightness or darkness of the image captured

What are Exposure Stops?

A unit of measurement that measures the change in luminance.

1 Stop is defined as:

• 2 times the amount of light if the stop is positive

• ½ the amount of light if the stop if negative

What is Dynamic Range

• The range that is perceptible between lightness and darkness values, from the lightest to the darkest

  • Human perception is around 24 stops

  • Digital photography is between 12 and 15 stops

What are the Exposure Tools?

• Aperture (F-Stop)

• Shutter Speed

• Light

• ISO (sort of, not really)

What is Aperture?

• Opening inside the lens that lets a regulated amount of light through

• Blades inside the lens open and close depending on the aperture setting

For f-stop the smaller the number the larger the opening which = more light

What is Shutter Speed?

• Measurement of the time that the shutter is open, exposing the sensor to the amount of light coming through the lens

  • Fractions of a second

    • 1/2 more light

    • 1/500 less light

The slower the shutter closes the more light gets captured.

The faster the shutter closes the less light is captured

What is ISO?

• The sensors sensitivity to light. The larger the number the more sensitive the sensor becomes

  • As the sensitivity increases, the less light it takes & the amount of digital artifacts and noise increase

  • The image starts to become more degraded as the ISO increases

  • Normal operating range of ISO is between 100 and 1600

In simple terms what do the numbers in Aperture mean?

• Lower Numbers = More Light

• Higher Numbers = Less Light

In simple terms what do the numbers in Shutter Speed mean?

• Lower Numbers (Slower) = More Light

• Higher Numbers (Faster) = Less Light

What is the difference between Aperture (f-stop) and Shutter Speed?

Aperture (f-stop)

• how blurry the background of the image is (depth of field)

Shutter Speed

• how sharp/clear the image is

What are good starter settings for being Inside?

• ISO: 800

• Shutter: 1/100

• Aperture: Wideset (f2.8-f5.6)

What are good starter settings for being Outside?

• ISO 100

• Shutter: 1/500

• Aperture: Middle Range (f4.0-f8)

What are all the standard stops for Aperture?

f/2.8 f/4 f/5.6 f/8 f/11 f/16 f/22

What are all the standard stops for Shutter Speed?

1/500 1/250 1/125 1/60 1/30 1/15 1/8 1/4 1/2