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 desired.
This AF operation is suited for moving subjects when the focusing 
distance keeps changing. While you hold down the shutter button 
halfway, the subject will be focused continuously.
  The exposure is set at the moment the picture is taken.
 
When the AF area selecti on mode is set to 19-point automatic selection AF 
(p.103), the camera first uses the manua lly-selected AF point to focus. During 
autofocusing, if the subject moves away  from the manually-selected AF point, 
focus tracking continues as  long as the subject is covered by the Area AF frame.
One-Shot AF for Still Subjects
Focus confirmation lightAF point
AI Servo AF for Moving Subjects
 
If focus cannot be achieved, the focus confirmation light  in the 
viewfinder will blink. If th is occurs, the picture cann ot be taken even if the 
shutter button is pres sed completely. Recompos e the shot and try to 
focus again, or see “Whe n Autofocus Fails” (p.109).
 
If [z 1: Beep] is set to [Disable], the beeper will not sound when focus is achieved. After achieving focus with One-Shot AF , you can lock the focus on a subject 
and recompose the shot. This is called “focus lock”. This is conve\
nient when 
you want to focus on a subject  not covered by the Area AF frame.
With AI Servo AF, the beeper will no t sound even when focus is achieved. 
Also, the focus confirmation light < o> in the viewfinder  will not light up.
COPY  
						

							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 the 
subject to enable easier autofocusing.
AI Focus AF for Switching th e AF Operation Automatically
AF-Assist Beam with the Built-in Flash
When focus is achieved with AI Focus AF with the Servo operation active, 
the beeper will continue beeping soft ly. However, the focus confirmation 
light < o> in the viewfinder will not light  up. Note that focus will not be 
locked in this case.
  AF-assist beam will not be emitte d by the built-in flash in , < 3>, or 
 mode, or when [ Flash firing] is set to  in , < C>, 
, < 4>, or < F> mode.
  The AF-assist beam cannot be emit ted with AI Servo AF operation.
 The effective range of the AF-assist beam emitted by the  built-in flash is 
approx. 4 meters/13.1 feet.
  In Creative Zone modes,  when you raise the built-in flash with the < I> 
button, the AF-assist beam  will fire when necessary.
COPY  
						

							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 AF Area N
AF Area Selection Mode
COPY  
						

							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 AF area selec. mode ], you can limit the 
selectable AF area selection modes (p.372).
  If you set [ 8C.Fn II-8: AF area  selection method] to [ 9Main Dial ], 
you can select the AF area sele ction mode by pressing the  or 
 button, then  turning the  dial (p.372).
COPY  
						

							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 selected.
  You can also select a horizontal AF 
point by turning the  dial and 
select a vertical AF point by turning 
the < 5> dial. 
  In the Zone AF mode, turning the 
 or < 5> dial will change the 
zone in a looping sequence.
Selecting the AF Point Manually
  When you hold down the < Q> button and turn the < 6> dial, you can 
select a vertic al AF point.
  When you press the  or < B> button, the LCD panel displays the 
following:
• 19-point automatic sele ction AF and Zone AF (m anual zone selection):  
  AF
• 1 pt AF (Manual selection): SEL   (Center)/SEL AF (Off center)
  With [ 8C.Fn II-10: Manual AF  pt. selec. pattern], you can set either 
[ Stops at AF area edges ] or [Continuous ] (p.373).
COPY  
						

							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 Modes
Single-point AF (Manual Selection)
Zone AF (Manual Zone Selection)
COPY  
						

							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>.
19-point Automatic Selection AF
  When AI Servo AF mode is set with  19-point automatic selection AF or 
Zone AF, the active AF point < S> will keep switch ing to track the 
subject. However, under certain shoo ting conditions (such as when the 
subject is small), it may not be abl e to track the subject. Also, in low 
temperatures, the tracking  response is slower.
  If the camera cannot focus with th e EOS-dedicated external Speedlite’s 
AF-assist beam, set the  AF area selection mode  to Single-point AF 
(manual selection) and select th e center AF point to autofocus.
  When the AF point(s) light up, part or all of the viewfinder may light up in 
red. This is a characteristic of AF point display (using liquid crystal).
If you set [8 C.Fn II-9 : Orientation linked AF point ] to [1: Select 
separate AF points], you can set the AF ar ea selection mode and 
manually-selected AF point (or zone) se parately for vertical and horizontal 
shooting (p.373).
COPY  
						

							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 remaining 18 AF points perform cross-type focusing, as with when 
maximum lens aperture is f/3.2 - f/5.6.
* Except with the EF28-80mm f/2.8-4L  USM and EF50mm f/2.5 Compact Macro.
AF Operation and Maximum Lens Apertures
Lenses that Do Not Support Cross-Type Focusing with 
Peripheral AF Points
Cross-type focusing at the < > and < >  AF points is not possible with the 
following lenses:
EF35-80mm f/4-5.6, EF35-80mm f/4 -5.6 II, EF35-80mm f/4-5.6 III, 
EF35-80mm f/4-5.6 USM, EF35-105 mm f/4.5-5.6, EF35-105mm f/4.5-5.6 
USM, EF80-200mm f/4.5-5.6 II,  EF80-200mm f/4.5-5.6 USM
 Cross-type focusing
 Vertical line-sensitive focusing
 Horizontal line-sensitive focusing
COPY  
						

							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 keyboards, etc.)
In such cases, do either of the following:
(1) With One-Shot AF, focus an object at the same distance as the 
subject and lock the focus before recomposing the shot (p.75).
(2) Set the lens focus mode switch to < MF> and focus manually 
(p.110).
When Autofocus Fails
For subjects difficult to focus during  Live View shooting or movie shooting 
with [u +Tracking ], [FlexiZone - Multi], or [ FlexiZone - Single], see page 
241.
COPY  
						

							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.
COPY