Canon EOS 5D Mark III Instruction Manual (en)

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187
When you use the self-timer or shoot bulb exposures and do not look 
through the viewfinder, stray light entering the viewfinder can cause the 
image to come out dark. To prevent this, use the eyepiece cover (p.27) 
attached to the camera strap.
During Live View shooting and movie shooting, attaching the eyepiece 
cover is not necessary.
1
Remove the eyecup.
 
While grasping both sides of the 
eyecup, slide it upward to remove.
2
Attach the eyepiece cover.
 
Slide the eyepiece cover down into 
the eyepiece groove to attach it.
Using the Eyepiece Cover
F
 Using a Remote Switch
You can connect the Remote Switch RS-80N3 or Timer Remote 
Controller TC-80N3 (both sold separately) or any EOS accessory 
equipped with an N3-type terminal to the camera for shooting (p.362).
To operate the accessory, refer to its instruction manual.
1
Open the terminal cover.
2
Connect the plug to the remote 
control terminal.
 
Connect the plug as shown in the 
illustration.
 
To disconnect the plug, grasp the 
silver part and pull.