Nikon D3 - Manual (Page 417)

391
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Replacing the Focusing Screen
A type B clear-matte VI focusing screen is inserted in the camera at
shipment. To insert an optional type E clear-matte VI focusing
screen for D3 cameras (pg. 384):
1
Remove the lens.
Turn the camera off and remove the lens.
2
Unlatch the screen holder.
Using the tweezers supplied with the
focusing screen, pull the focusing screen
latch towards you. The screen holder will
spring open.
3
Remove the existing screen.
Remove the existing screen, using the
supplied tweezers and being careful to
handle the screen by the tab to avoid
scratches.
4
Insert the replacement screen.
Using the tweezers and handling the
screen by the tab, set the replacement
screen in the holder.