Using The Eyepiece Cover - Canon EOS 6D Mark II Instruction Manual

Using the Eyepiece Cover

When you take a picture without looking through the viewfinder, such as
when you use the self-timer, bulb exposure, or a remote switch, stray
light entering the viewfinder may cause the picture to look dark
(underexposed). To prevent this, use the eyepiece cover (p.38)
attached to the camera strap.
Note that attaching the eyepiece cover is not necessary in Live View
shooting or movie shooting.
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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.