The Three Principles of Exposure
In this Digital Photography class, I have learned many things about taking good pictures. There are three principles of exposure. They include aperture, ISO, and shutter speed.
Aperture affects the focus of the picture. A smaller aperture reveals more detail with a clear background and expands the area of sharp focus also called the depth of field. A wider aperture has a soft focus and shows a more narrow depth of field which blurs out the background. On the camera, the aperture number decreases as the aperture gets wider and vice versa. The aperture is also called the Iris or the f/stop which controls the amount of light let in.
Tree In Front of My House
Wide Open Aperture (F/1.8)
The ISO determines how quickly a camera absorbs light. A lower ISO number creates a cleaner image while a higher ISO has more noise. The "noise" in an image is due to a higher ISO. As the ISO number increases, the camera's sensitivity to light increases too. A lower ISO is preferred because it has better overall quality and has less "noise" than a higher ISO.
Soccer Ball and Football in SCHS Gym
Less Noise More Noise
The Shutter Speed is the amount of time the film is exposed to light. The longer the shutter stays open, the more light enters into the camera. A faster shutter speed (ex: 1/4000 sec.) freezes action. It's good to use sports mode to shoot consecutive shots quickly. The motion blur that is created shows the speed of the object or person in the image. A slower shutter speed causes more of the film to be exposed to light. This could possibly lead to overexposure of an image. Furthermore, a slow shutter speed also causes blur in the image when an object is moving.
Mr. Wilson Riding a Bike in SCHS Tennis Courts
Fast Shutter Speed
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