Nikon Df User Manual page 43

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The Eyepiece Cap
Use the supplied string to attach the eyepiece cap to the camera strap
as shown.
To prevent light entering via the viewfinder interfering with exposure,
attach the eyepiece cap during live view, long time-exposures, self-
timer photography, and on other occasions in which you will not be
looking through the viewfinder while the shutter is open. To remove the
cap, press the clips and lift.
A
Removing the Viewfinder Eyepiece
The viewfinder eyepiece must be removed
before optional diopter adjustment viewfinder
lenses can be attached. To remove the eyepiece,
grasp it lightly between your finger and thumb
and rotate it as shown.
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