Canon 550D - Manual (Page 205)

205
Remote Control Shooting
This remote switch has a 60 cm/2.0 feet cord and enables you to press
the shutter button halfway or completely. It connects to the camera’s
remote control terminal.
If you take a picture without looking at the viewfinder, light entering the
eyepiece can throw off the exposure. To prevent this, use the eyepiece
cover (p.23) attached to the camera strap.
During Live View shooting and movie shooting, attaching the
eyepiece cover is unnecessary.
1
Remove the eyecup.
Push the bottom of the eyecup
upward.
2
Attach the eyepiece cover.
Slide the eyepiece cover down into
the eyepiece groove to attach it.
Remote Switch RS-60E3 (Sold separately)
Using the Eyepiece Cover