Checking the [Mirror lockup] setting
During viewfinder shooting, if the shutter does not release when the shutter button is pressed fully, check the [C.Fn III-8:Mirror lockup] setting in [Custom Functions (C.Fn)] from the menu on the LCD. If the setting is set to [1:Enable], change it to [0:Disable] to disable the mirror lockup.
Note:
If the Mirror lockup is set, the mirror swings up when the shutter button is pressed fully, and the viewfinder is blacked out. When the shutter button is pressed fully again, the mirror goes down and the picture is taken.
The camera's mechanical shake caused by the reflex mirror action can blur images taken with a super telephoto lens or close-up (macro) lens. In such cases, mirror lockup is effective.
For details about mirror lockup, refer to the instruction manuals that came with your camera.
Disabling the [Mirror lockup] setting
To disable the Mirror lockup setting, follow the steps below.
1. Set the power switch to <ON>.
2. Press the <MENU> button.
3. Press the <Cross Keys> to select [Custom Functions (C.Fn)] under the [ 
], then press the <SET> button.
4. Press the <Cross Keys> to select [C.Fn III-8: Mirror lockup], then press the <SET> button.
5. If [1:Enable] is selected, select [0:Disable], and then press the <SET> button.
6. To exit and return to the menu, press the <MENU> button.
