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Checking the [Mirror lockup] setting
During viewfinder shooting, if the shutter does not release when the shutter button is pressed fully, check the [ 
Caution
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 manual that came with your camera.
Disabling the [Mirror lockup] setting
To disable the Mirror lockup setting, follow the steps below.
1. Set the camera’s power switch to ⋖ON⋗.
2. Set the Mode Dial to ⋖ P / Tv / Av / M / B⋗.
3. Press the ⋖MENU⋗ button to display the menu screen.
4. Press the ⋖
5. Turn the ⋖
6. Turn the ⋖
7. Turn the ⋖
