Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 157)

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Eyepiece Cover
Shots taken without looking through the viewfi nder (as when using the self-
timer or a remote control) may be underexposed. To prevent this, use the
eyepiece cover ( = 41) attached to the camera strap.
Note that attaching the eyepiece cover is not necessary in Live View
shooting or movie recording.
1 Detach the eyecup.

Push the bottom of the eyecup to detach
it.
2 Attach the eyepiece cover.

Slide the eyepiece cover down into the
eyepiece groove to attach it.

After you fi nish shooting, detach the
eyepiece cover and attach the eyecup.