Digital Photography For Dummies by Julie Adair King

Author:Julie Adair King
Language: eng
Format: epub, pdf
ISBN: 9781119235644
Publisher: Wiley
Published: 2016-06-01T00:00:00+00:00

Continuous-servo autofocusing: This mode is designed for photographing moving subjects. The camera sets the initial focusing distance just as it does in single-servo mode, but then adjusts focus continuously as needed up to the time you take the shot. So if you set focus on a subject that's 20 feet in front of you but don't take the picture until the subject is 10 feet away, it should still be in focus.

Not all cameras offer this degree of autofocusing flexibility, however. Some models don't offer continuous autofocusing, and others decide for you whether to use single- or continuous-servo autofocusing. If the camera senses motion in front of the lens, it uses continuous-servo autofocusing; if not, it sticks with single-servo.

Even on cameras that do enable you to make the call, the default mode is usually the automatic (camera's choice) setting. To access the other options, you may need to switch to an advanced exposure mode, such as aperture-priority autoexposure or manual exposure.

Also note that these settings go by different names, depending on the manufacturer. For example, most Canon cameras use the terms One Shot for single-servo autofocus; AI Servo for continuous autofocus (AI stands for artificial intelligence); and AI Focus for the automatic mode that lets the camera decide whether focus is locked. Nikon, on the other hand, uses the terms AF-S for single-servo; AF-C or AF-F for continuous-servo (C for continuous and F for full-time autofocusing); and AF-A to represent the Auto setting.

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