Canon EOS 5D Mark III Instruction Manual (en)

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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.
* <a> stands for Manual.
1
Set the Mode Dial to <a>.
2
Set the ISO speed 
(p.126)
.
3
Set the shutter speed and aperture.
 
To set the shutter speed, turn the <6> dial.
 
To set the aperture, turn the <5> dial.
 
If it cannot be set, set the <R> switch 
to the left, then turn the <6> or <5> dial.
4
Focus 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.
5
Set the exposure and take the 
picture.
 
Check the exposure level and set the 
desired shutter speed and aperture.
 
If the exposure compensation amount 
exceeds ±3 stops, the end of the exposure 
level indicator will display <I> or <J>.
a
: Manual Exposure
Exposure level mark
Standard exposure index
If ISO Auto is set, the ISO speed setting will change to suit the shutter speed 
and aperture to obtain a standard exposure. Therefore, you may not obtain 
the desired exposure effect.