Canon EOS 550D 用户手册

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页码 260
83
You can set both the shutter speed and aperture manually as desired. 
With flash, the flash exposure will be set automatically to match the 
aperture that was set. The flash sync speed can be set within 1/200 
sec. to 1/30 sec. or to bulb.
* <a> stands for Manual.
1
Set the Mode Dial to <a>.
2
Set the shutter speed and 
aperture.
 
To set the shutter speed, turn the 
<6> dial.
 
To set the aperture, hold down the 
<O> button and turn the <6> 
dial.
3
Set the exposure and take the 
picture.
 
The exposure level indicator in the 
viewfinder indicates the exposure 
level up to ±2 stops from the standard 
exposure index at the center. While 
you change the shutter speed and 
aperture, the exposure level mark will 
move. You can decide which 
exposure level to set. If the amount 
set exceeds ±2 stops, the end of the 
exposure level indicator will display 
<I> or <J>.
a
: Manual Exposure
<6>
<O> + <6>
Exposure level mark
Standard exposure index
If the [2 Auto Lighting Optimizer] (p.103) is set to anything other than 
[Disable], the image may still look bright even if a darker exposure has been 
set.
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