Aperture adjusts the amount of light reaching the film or sensor. A large opening allows the most light to pass through the lens. The smallest opening allows the least amount of light to pass through.
-the button is the AV button, and you hold it and rotate the wheel to select a number.
ISO speed is the sensor's or film's sensitivity to light. The higher the number the faster it is and the less light it needs for a picture. 100-200 if outdoors, 400 or up in dim light.
-This can be found as the ^ button, and you navigate through and select the number you want.
The shutters open and close to control the length of time that light strikes the light-sensitive surface. This is already selected on the screen, and you have to turn the wheel to change the number.
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