ISO, Aperture, and Shutter Speed: Review
ISO (Sensitivity)
Aperture (F-Stop)
Aperture
controls HOW MUCH light is allowed into the camera through the lens. It
is similar to your eye squinting. When you squint things become
sharper, but when you open your eyes all the way you get better light.
The
lower the f-stop or aperture, the more light that is being allowed in.
The higher the f-stop or aperture the less light that is being let in.
Aperture
can have dramatic affects on your photographs beside the amount of
light. Aperture has a large effect on the depth-of-field (area of
focus). The higher the aperture the greater the depth of field (more of
your photograph will be in focus). The lower the aperture the smaller
the depth of field (lessarea in focus).
When
photographers talk about “closing down” or “opening up” they are
referring to changing the aperture. Closing down means to let less light
into the camera, and opening up means letting more light into the
camera.
Shutter Speed
Shutter
speed controls HOW LONG light is allowed to hit the camera sensor.
Shutter speeds are a fraction of a second. A shutter speed of 60 is
actually 1/60 of a second.
View the video on Aperture, Shutter Speed and ISO and answer the questions below.
CLICK HERE TO VIEW THE VIDEO
1. What three items make up the Exposure Triangle?
2. What is Aperture?
3. Which Aperture setting is larger; f1.4 or f16?
4. What is Shutter Speed?
5. Which Shutter Speed setting will show blurring of your subject? 1/250, 1/125 or 1/15?
6. What effect does using a high ISO setting have on the quality of your photo?
7. What effect does using a low ISO setting have on the quality of your photo?
