Canon 70d W User Manual

							161
s: Shutter-Priority AE
 If the lower f/number blinks , it indicates underexposure.
Turn the < 6> dial to set a slower  shutter speed until 
the aperture stops blinking  or set a higher ISO speed.
  If the higher f/number blinks , it indicates overexposure.
Turn the < 6> dial to set a faster  shutter speed until 
the aperture stops blinking  or set a lower ISO speed.
Shutter Speed Display
The shutter speeds from “8000” to “4” indicate the denominator of the 
fractional shutter speed. For example, “ 125” indicates 1/125 sec., “ 05” 
indicates 0.5 sec. and “ 15” is 15 sec.
COPY  
						

							162
In this mode, you set the desired aperture and the camera sets the 
shutter speed automatically to obtain the standard exposure suiting the 
subject brightness. This is called aperture-priority AE. A higher f/
number (smaller aperture hole) will make more of the foreground and 
background fall within acceptable focus. On the other hand, a lower f/
number (larger aperture hole) will  make less of the foreground and 
background fall within acceptable focus.
* < f > stands for Aperture  value (aperture opening).
1Set the Mode Dial to < f>.
2Set the desired aperture.
 While looking at the LCD panel, turn 
the < 6> dial.
3Focus the subject.
 Press the shutter button halfway.
X The shutter speed is set 
automatically.
4Check the viewfinder display and shoot.
 As long as the shutter speed is not blinking, 
a standard exposure will be obtained.
f : Aperture-Priority AE
Sharp foreground and background
(With a high aperture f/number: f/32)Blurred background
(With a low aperture f/number: f/5.6)
COPY  
						

							163
f: Aperture-Priority AE
The aperture opening (diaphragm) changes only at the moment when 
the picture is taken. Otherwise,  the aperture remains fully open. 
Therefore, when you look at the sce ne through the viewfinder or on the 
LCD monitor, the depth of field will look narrow.
Press the depth-of-field preview button 
to stop down the lens to the current 
aperture setting and check the depth of 
field (range of acceptable focus).
Depth-of-Field PreviewN
 If the “ 30” shutter speed blinks, it indicates 
underexposure.
Turn the < 6> dial to set a larg er aperture (lower f/
number) until the shutter spee d blinking stops or set a 
higher ISO speed.
  If the “ 8000” shutter speed blin ks, it indicates 
overexposure.
Turn the < 6> dial to set a smaller aperture (higher 
aperture f/number)  until the shutter speed blinking stops 
or set a lower ISO speed.
Aperture Display
The higher the f/number,  the smaller the aperture opening will be. The 
apertures displayed will differ  depending on the lens. If no lens is attached to 
the camera, “ 00” will be displayed for the aperture.
  A higher f/number will make more of th e foreground and background fall 
within acceptable focus. However, the viewfind er will look darker.
  The depth-of-field effect can be clea rly seen on the Live View image as 
you change the ap erture and press the depth- of-field preview button 
(p.216).
  The exposure will be lo cked (AE lock) while the  depth-of-field preview 
button is pressed.
COPY  
						

							164
In this mode, you set both the shutter speed and aperture as desired. To 
determine the exposure, refer to the exposure level indicator in the 
viewfinder or use a commercially-available exposure meter. This 
method is called manual exposure.
*  stands for Manual.
1Set the Mode Dial to < a>.
2Set the ISO speed (p.120).
3Set the shutter speed and aperture.
  To set the shutter speed, turn the 
 dial.
 
To set the aperture, turn the  dial.  If it cannot be set, set the < R> 
switch downward, then turn the 
< 6 > or < 5> dial.
4Focus the subject.
  Press the shutter button halfway.
X
The exposure setting will be displayed 
in the viewfinder and on the LCD panel.
  The exposure level mark < h> 
indicates how far the current 
exposure level is from the standard 
exposure level.
5Set the exposure and take the 
picture.
  Check the exposure level indicator 
and set the desired shutter speed and 
aperture.
  If the exposure level exceeds ±3 
stops from the standard exposure, 
the end of the exposure level 
indicator will display < I> or .
a : Manual Exposure
Exposure level mark
Standard exposure index
COPY  
						

							165
q Selecting the Metering Mode N
1Press the  button. (9)
2Select the metering mode.
  While looking at the LCD panel, turn 
the < 6> or < 5> dial.
q : Evaluative metering
w : Partial metering
r : Spot metering
e : Center-weighted average 
metering
q Evaluative metering
This is a general-purpose metering mode suited 
even for backlit subjects. The camera sets the 
exposure automatically to suit the scene.
If Auto ISO is set, the IS O speed setting will change  to suit the shutter speed 
and aperture in order to  obtain a standard expos ure. Therefore, you may not 
obtain the desired  exposure effect.
 In [z3: Auto Lighting Optimizer ], if the checkmark  for [Disabled 
in M or B modes ] is removed, Auto Lighting  Optimizer can be set in the 
 and < F> modes (p.140).
  When Auto ISO is set, you can press the  button to lock the ISO 
speed.
  If you press the < A> button and recompose th e shot, you can see the 
exposure level difference on the ex posure level indicator (p.22, 23) 
compared to when the < A> button was pressed.
q Selecting the Metering Mode N
You can select one of four methods  to measure the subject brightness. In Basic Zone modes, evaluative metering is set automatically.
COPY  
						

							q Selecting the Metering Mode N
166
w Partial metering
Effective when the background is much brighter 
than the subject due to backlighting, etc. The 
metering is weighted at the center covering approx. 
7.7% of the viewfinder area.
r Spot metering
This is for metering a specif ic spot of the subject or 
scene. The metering is weighted at the center 
covering approx. 3.0% of the viewfinder area.
e Center-weighted average metering
The metering is weighted at  the center and then 
averaged for the entire scene.
  With  q (Evaluative metering), the exposure setting  will be locked when 
you press the shutter button halfwa y and focus is achieved. In the w 
(Partial metering),  r (Spot metering), and  e (Center-weighted 
average metering) modes, the exposure  is set when the photo is taken. 
(Pressing the shutter button half way does not lock the exposure.)
  When < r> is set, < z> can be displayed in the viewfinder (p.376).
COPY  
						

							167
Exposure compensation can brighten (increased exposure) or darken 
(decreased exposure) the standard exposure set by the camera.
Exposure compensation can be set in the d /s/f  shooting modes. 
Although you can set the exposure co mpensation up to ±5 stops in 1/3-
stop increments, the expo sure compensation indicator in the viewfinder 
and on the LCD panel can only display the setting up to ±3 stops. If you 
want to set the exposure compensation  setting beyond ±3 stops, use the 
Quick Control (p.50) or fo llow the instructions for
 [z3: Expo.comp./AEB ] on the next page.
1Check the exposure level indicator.
 Press the shutter button halfway (0 ) 
and check the exposur e level indicator.
2Set the exposure compensation amount.
 While looking at the viewfinder or 
LCD panel, turn the < 5> dial.
 
If it cannot be set, set the  switch downward, then turn the  dial.
3Take the picture.
  To cancel the exposure 
compensation, set the exposure 
compensation amount back to < E>.
Setting Exposure Compensation N
Increased exposure for a 
brighter image
Decreased exposure for a 
darker image
If [z3: Auto Light ing Optimizer ] (p.140) is set to any setting other than 
[ Disable ], the image may look bright even if a decreased exposure 
compensation is set.
  The exposure compensation  amount will remain in effect even after you 
set the power switch to < 2>.
  After setting the exposure compen sation amount, you can set the 
 switch upward to prevent the  exposure compensation amount 
from changing accidentally.
  If the exposure compensation amount  exceeds ±3 stops, the end of the 
exposure level indi cator will display  or < J>.
COPY  
						

							168
By changing the shutter speed or aperture automatically, the camera 
brackets the exposure up to ±3 st ops in 1/3-stop increments for three 
successive shots.  This is called AEB.
* AEB stands for Auto  Exposure Bracketing.
1Select [Expo.comp./AEB].
 Under the [ z3] tab, select 
[Expo.comp./AEB ], then press 
< 0 >.
2Set the AEB range.
  Turn the < 6> dial to set the AEB 
range. Press the < U> key to set 
the exposure compensation amount.
  Press < 0> to set it.
X When you exit the menu, < h> and 
the AEB range will be displayed on 
the LCD panel.
3Take the picture.
  The three bracketed shots will be 
taken according to the drive mode set 
in this sequence: Standard exposure, 
decreased exposure, and increased 
exposure.
  AEB will not be automatically 
canceled. To cancel AEB, follow step 
2 to turn off the AEB range display.
h  Auto Exposure Bracketing (AEB) N
AEB range
COPY  
						

							169
h Auto Exposure Bracketing (AEB) N
 During AEB shooting, < A> in the viewfinder and < h> on the LCD 
panel will blink.
  If the drive mode is set to < u> or < B>, press the shutter button three 
times for each shot. When , < i>, or  is set and you hold 
down the shutter button completely,  the three bracketed shots will be 
taken continuously and the camera  will automatically stop shooting. 
When < Q> or < k> is set, the three bracke ted shots will be taken 
continuously after a 10-sec. or 2-sec. delay.
  You can set AEB in combination  with exposure compensation.
  If the AEB range exceeds ±3 stops,  the end of the exposure level 
indicator will display < I> or < J>.
  AEB cannot be used with flash, [ Multi Shot Noise Reduction], Creative 
Filters, or bulb exposures.
  AEB will be canceled automatically when you set the power switch to 
 or when the flash is ready to fire.
COPY  
						

							170
Use AE lock when the area of focus is to be different from the exposure 
metering area or when you want to take multiple shots at the same exposure 
setting. Press the 
< A > button to lock the  exposure, then recompose and take the shot. This is called AE lock.  It is effective for backlit subjects.
1Focus the subject.
 Press the shutter button halfway.
XThe exposure setting will be displayed.
2Press the < A> button. (0 )
X The < A> icon lights up in the 
viewfinder to indicate that the 
exposure setting is locked (AE lock).
  Each time you press the < A> button, 
the current autoexposure setting is 
locked.
3Recompose and take the picture.
  If you want to maintain the AE lock 
while taking more shots, hold down 
the < A> button and press the shutter 
button to take another shot.
* When the lens’ focus mode  switch is set to , AE lock is applied at the 
center AF point.
A  AE Lock N
AE Lock Effects
Metering Mode  
(p.165)AF Point Selection Method  (p.103-105)Automatic SelectionManual Selection
q*AE lock is applied at the AF 
point that achieved focus.AE lock is applied at the 
selected AF point.
wreAE lock is applied at the center AF point.
AE lock is not possible  with bulb exposures.
COPY