Canon Eos Rebel T3i 600d Instruction Manual

131
The AF modes available are [Live mode], [u Live mode ] (face 
detection, p.132), and [ Quick mode] (p.136).
If you want to achieve precise focus, set the lens focus mode switch to \
< MF>, magnify the image, and  focus manually (p.138).
Select the AF mode.
 Under the [ z] tab, select [ AF mode] 
([ 2 ] tab in Basic Zone modes).
  Select the desired AF mode, then 
press < 0>.
  While the Live View image is 
displayed, you can press the < Q> 
button to select the AF mode on the 
Quick Control screen...

132
Changing the Autofocus Mode
3Focus the subject.
 Aim the AF point over the subject and 
press the shutter button halfway.
X When focus is achieved, the AF point 
will turn green a nd the beeper will 
sound.
X If focus is not achieved, the AF point 
will turn orange.
4Take the picture.
  Check the focus and exposure, then 
press the shutter button completely to 
take the picture (p.124).
With the same AF method as the Live mode, human faces are detected 
and focused. Have the target  person face the...

133
Changing the Autofocus Mode
2Focus the subject.
 Press the shutter button halfway and 
the camera will focus the face 
covered by the < p> frame.
X When focus is achi eved, the AF point 
will turn green a nd the beeper will 
sound.
X If focus is not achieved, the AF point 
will turn orange.
  If a face cannot be detected, the AF 
point < > will be displayed and AF 
will be executed at the center.
3Take the picture.
 Check the focus and exposure, then 
press the shutter button completely to 
take the...

134
Changing the Autofocus Mode
AF operation
 Focusing will take slightly longer.
  Even when focus has been achieved, pressing the shutter button 
halfway will focus again.
  The image brightness may cha nge during and after the AF 
operation.
  If the light source changes while th e Live View image is displayed, 
the screen might flicker and focusing may be difficult. If this 
happens, stop the Live View shooting and autofocus under the 
actual light source first.
  If you press the < u> button in the...

135
Changing the Autofocus Mode
Shooting conditions which can make focusing difficult:
 Low-contrast subjects such as the blue sky and solid-color, flat 
surfaces.
  Subjects in low light.
  Stripes and other patterns where  there is contrast only in the 
horizontal direction.
  Under a light source whose brightness, color, or pattern keeps 
changing.
  Night scenes or points of light.
  Under fluorescent lighting or when the image flickers.
  Extremely small subjects.
  Subjects at the edge of the...

136
Changing the Autofocus Mode
The dedicated AF sensor is used to focus in One-Shot AF mode (p.83), 
using the same AF method as with viewfinder shooting.
Although you can focus th e target area quickly, the Live View image 
will be interrupted momentarily during the AF operation.
1Display the Live View image.
 Press the < A> button.
X The Live View image will appear on 
the LCD monitor.
  The small boxes on the screen are 
the AF points, and the larger box is 
the magnifying frame.
2Select the AF...

137
Changing the Autofocus Mode
3Focus the subject.
 Aim the AF point over the subject and 
press the shutter button halfway.
X The Live View image will turn off, the 
reflex mirror will go back down, and 
AF will be executed.
X When focus is achi eved, the AF point 
which achieved focus will turn green 
and the Live View image will 
reappear.
X If focus is not achieved, the AF point 
will turn orange and blink.
4Take the picture.
  Check the focus and exposure, then 
press the shutter button completely...

138
You can magnify the image and focus precisely manually.
1Set the lens focus mode switch to 
.
 Turn the lens focusing ring to focus 
roughly.
2Move the magnifying frame.
 Press the < S> key to move the 
magnifying frame to the position 
where you want to focus.
  To return the magnifying frame to the 
center, press the  or  
button.
3Magnify the image.
  Press the < u> button.
X The area within the magnifying frame 
will be magnified.
  Each time you press the  button, 
the view will change as...

139
Live View Shooting Cautions
White  and Red < E> Internal Temperature Warning Icons  If the camera’s internal temperatu re increases due to prolonged Live 
View shooting or a high ambi ent temperature, a white  icon will 
appear. If you continue sh ooting while this icon is displayed, the image 
quality of still photos may deteriora te. You should stop the Live View 
shooting and allow the  camera to cool down before shooting again.
  If the camera’s internal temperatu re further increases while the...

140
Live View Shooting Cautions
Shooting Result Cautions When you shoot continuous ly with the Live View function for a long 
period, the camera’s internal temp erature may increase and it can 
degrade image quality. Terminate Live  View shooting when not shooting 
images.
  Before taking a long exposure, stop  Live View shooting temporarily and 
wait several minutes before shoo ting. This is to prevent image 
degradation.
  Live View shooting in high temperatures and at high ISO speeds may 
cause noise...