Canon 70d W User Manual

101
f: Selecting the AF Operation N
Suited for still subjects. When you 
press the shutter button halfway, the 
camera will focus only once.
 When focus is achi eved, the AF point 
that achieved focus will be displayed, 
and the focus confirmation light < o> 
in the viewfinder will also light up.
  With evaluative metering, the 
exposure setting will be set at the 
same time focus is achieved.
  While you hold down the shutter button halfway, the focus will be 
locked. You can then recompose the shot if...

f: Selecting the AF Operation N
102
AI Focus AF switches the AF operation from One-Shot AF to AI 
Servo AF automatically if a still subject starts moving.
 After the subject is focused in One-Shot AF, if the subject starts 
moving, the camera will detect  the movement, change the AF 
operation automatically to AI Se rvo AF, and keep tracking the 
moving subject.
Under low-light conditions, when you  press the shutter button halfway, 
the built-in flash may fire a brief  burst of flashes. It illuminates...

103
19 AF points are provided for AF. You can select the AF point(s) suiting 
the scene or subject.
You can select one of three AF area selection modes. See the next 
page for the selection procedure.
: Single-point AF (Manual 
selection)
Select one AF point to focus.
: Zone AF (Manual zone 
selection)
The 19 AF points are divided into five 
zones for focusing.
: 19-point automatic selection 
AF
All the AF points are used to focus.  This 
mode is set automatically in Basic 
Zone modes.
S  Selecting the...

S Selecting the AF Area N
104
1Press the  or  button. 
(9 )
  Look through the viewfinder and 
press the < S> or < B> button.
2Press the < B> button.
 Each time you press the < B> 
button, the AF area selection mode 
changes.
  The AF area selection mode currently 
set is indicated on the top of the 
viewfinder.
: Single-point AF 
(Manual selection)
:Zone AF  (Manual zone selection)
: 19-point automatic selection  AF
Selecting the AF Area Selection Mode
AF area selection mode
  With [ 8C.Fn II-7: Select...

105
S Selecting the AF Area N
You can manually select the AF po int or zone. If 19-point automatic 
selection AF + AI Servo AF has been set, you can select any position 
where AI Servo AF is to start.
1Press the < S> or  button. 
(9 )
X The AF points will be displayed in the 
viewfinder.
  In the Zone AF mode, the selected 
zone will be displayed.
2Select an AF point.
 The AF point selection will change in 
the direction you tilt < 9>. If you 
press < 0>, the center AF point (or 
center zone) will be...

106
Select one AF point  to be used for focusing.
The 19 AF points are divided into five zones for focusing. All the AF 
points in the selected zone are used for the automatic selection of the 
point of focus. It makes achieving focus easier than with single-point AF 
and it is effective for moving subjects.
However, since it is inclined to fo cus the nearest subject, focusing a 
specific target is harder than with single-point AF.
The AF point(s) achieving focus is displayed as < S>.
AF Area Selection...

107
AF Area Selection Modes
All the AF points are used to focus. This mode is set automatically in 
Basic Zone modes. 
With One-Shot AF, pressing the shutter button 
halfway will display the AF point(s) < S> that 
achieved focus. If multiple AF points are displayed, 
it means they all have achieved focus. This mode 
tends to focus the nearest subject.
With AI Servo AF, the manually-selected (p.105) AF 
point < S> is used first to achieve focus. The AF 
point(s) achieving focus is displayed as < S>....

AF Area Selection Modes
108
Maximum Lens Aperture: f/3.2 - f/5.6
With all AF points, cross-type AF sensitive to both vertical and 
horizontal lines is possible. Howe ver, with the lenses below, the 
peripheral AF points will detect only vertical or  horizontal lines (no 
cross-type focusing).
Maximum Lens Aperture: f/1.0 - f/2.8
Besides cross-type focusing (vertical and horizontal lines detected 
simultaneously), the center AF point  can also perform high-precision, 
vertical-line sensitive AF.*
The...

109
Autofocus can fail to achieve focus (viewfinder’s focus confirmation light 
< o > blinks) with certain subj ects such as the following:
Subjects Difficult to Focus
 Very low-contrast subjects
(Example: Blue sky, solid-color walls, etc.)
  Subjects in very low light
  Extremely backlit and  reflective subjects
(Example: Car with a highly reflective body, etc.)
  Near and far subjects covered by an AF point 
(Example: Animal in a cage, etc.)
  Repetitive patterns
(Example: Skyscraper windows, computer...

When Autofocus Fails
110
1Set the lens focus mode switch to 
.
X will be displayed on the 
LCD panel.
2Focus the subject.
  Focus by turning the lens focusing 
ring until the subject looks sharp in 
the viewfinder.
MF: Manual Focus
Focusing ring
If you press the shutter button halfway  during manual focusing, the AF point 
that achieved focus and the focus confirmation light < o> will light up in the 
viewfinder.
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