Nikon D4 - Manual (Page 43)

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The BS-2 Accessory Shoe Cover
The supplied BS-2 accessory shoe
cover can be used to protect the
accessory shoe or to prevent light
reflected from the metal parts of
the shoe from appearing in
photographs. The BS-2 attaches to
the camera accessory shoe as shown at right.
To remove the accessory shoe
cover, hold it down with your
thumb and slide it off as shown at
right while keeping a firm grip on
the camera.