Using The Eyepiece Cover - Canon EOS 450D Instruction Manual

Remote Controt Shooting
Using the Eyepiece COver
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 attached to the camera strap.
_ emove the eyecup.
_ Push the bottom of the eyecup
upward.
_, Attaching the eyepiece cover.
_ Slide the eyepiece cover down into
the eyepiece groove to attach it.
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