Page 20 - Learning How to Photograph with your DSLR Camera 2nd Edition Jan 2021

focus) by adjusting the aperture. If it is a low-lit arena, you can control how high your
ISO goes for increased image brightness.

Another example would be in portrait photography. On AUTO you may not get the
photograph you are looking for. You want the image well exposed and the background
blurred, mainly focusing on the facial features of your subject. Aperture or Manual mode
would be appropriate. In Aperture (A or AV) mode you select the aperture, and the
camera chooses the shutter speed. Or, in Manual, you can select the aperture, shutter
speed, and ISO.

When adjusting Aperture, Shutter Speed, or ISO a correct exposure is determined
when the cameras metering system indicates 0. More on this in Lesson 4.

The Stop System

What is a Stop? In simplest terms it is an adjustment to the Aperture, Shutter Speed or
ISO that will halve or double the amount of light entering the camera (1 full Stop). We
frequently discuss Stops in photography to create an affect or adjust our exposure.

The below chart illustrates a full stop with each change, such as a shutter speed of
1/1000 to 1/500 is a full stop, as is a Aperture f/8 to f11 and a ISO of 400 to 800 is a full
stop. A Stop change in Aperture Priority will adjust the DoF, while the camera calculates
the shutter speed for the exposure. A stop change in Shutter Priority will affect motion,
while the camera calculates the Aperture for the exposure.

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