
Using Other EOS-Dedicated  Speedlites 
With an 
The flash exposure is controlled by 
(1)When you press the shutter button halfway, the shutter speed and aperture are set automatically by the camera as with normal 
Mode  | Shutter Speed Setting  | Flash Aperture Setting  | 
(Program AE)  | Auto (1/60 sec. - 1/250 sec.)  | Auto  | 
(Shutter   | Manual (30 sec. - 1/250 sec.)  | Auto  | 
Auto (30 sec. - 1/250 sec.)  | Manual  | |
(Manual)  | Manual (30 sec. - 1/250 sec.)  | Manual  | 
(2)When you press the shutter button completely, TTL autoflash based on the aperture set in (1) is used.
(3)The background exposure is set by the shutter speed and aperture combination.
• Flash exposure compensation can also be set with the camera.
•If the 
•About automatic reduction of flash output
If an 
C.Fn 
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