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Canon 80D Experience
the photo, the camera may not be finding enough contrast to focus on, you may be too
close to your subject for the lens to focus, or the lighting may be too dim for the AF
system to work properly.
You can also use 45-point Automatic Selection AF with One-Shot AF, where the camera
chooses which of the 45 AF Points to use to focus on the subject. When shooting in
One-Shot AF Mode and choosing this mode, the camera will use all 45 AF Points to
automatically locate the closest subject (generally) and focus on that. Or if you have
enabled C.Fn II-12: Auto AF Point Selection: Color Tracking, the camera will look for
skin tones in order to focus on a human subject. Since the camera does not know what
your intended subject is, it will not consistently focus where you may want it to, and thus
manual AF Point selection rather than automatic AF Point selection is recommended for
most situations.
If you are photographing a subject that is approaching or receding from view at a
relatively constant rate, or photographing a subject that is moving about the frame, or
photographing sports, action, or active wildlife you will instead usually want to use AI
Servo AF focus mode.
Figure 168 - Autofocus AF Modes - One-Shot AF is used to focus on a still subject (left),
and AI Servo AF can be use to retain continuous autofocus on a moving subject (right).
AI Servo AF Focus Mode
This mode, used in conjunction with the various AF Area Selection Modes and the
autofocus related Custom Function settings, is what makes the 80D such a powerful,
well-performing camera for capturing action and motion. To take full advantage of this
mode you will need to also understand the AF Area Selection Modes, as will be
described in the Autofocus - AF Area Selection Modes section just below. AI Servo
mode is used for tracking and focusing on moving subjects, and is ideal for capturing
sports and wildlife including birds. If the subject is moving towards you or away from
you, the camera will keep evaluating the focus distance, and if the subject is moving
from side to side or throughout the frame the camera may track it as it passes from one
AF Point to the immediate surrounding ones or to any of the other points - depending on
which AF Area Selection Mode you are using. The Autofocus Custom Functions options
will even allow you to tell the camera exactly how fast to react to new subjects that
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