Canon EOS Rebel T6i W Instruction Manual page 351

F Remote Switch RS-60E3 (Sold Separately)
Remote Switch RS-60E3 (sold separately) comes with an approx. 60
cm/2.0 ft cord. When connected to the camera's remote control
terminal, it can be pressed halfway and completely, just like the shutter
button.
Using the Eyepiece Cover
When you use the self-timer, bulb, or Remote Switch and do not look
through the viewfinder, stray light entering the viewfinder can cause the
picture to look dark. To prevent this, use the eyepiece cover (p.33)
attached to the camera strap.
During Live View shooting and movie shooting, attaching the
eyepiece cover is unnecessary.
Detach the eyecup.
1
Push the bottom of the eyecup to

detach it.
Attach the eyepiece cover.
2
Slide the eyepiece cover down into

the eyepiece groove to attach it.
After you finish shooting, detach the

eyepiece cover and attach the
eyecup by sliding it down into the
eyepiece groove.
Remote Control Shooting
351