Nikon D6 Reference Manual page 1114

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DK-17F Fluorine-Coated Finder Eyepiece: A DK-17F is supplied with
the camera. The protective glass features Nikon's unique, easy-to-clean
fluorine coating on both surfaces.
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DR-5 Right-Angle Viewing Attachment: The DR-5 attaches to the
viewfinder eyepiece at a right angle, allowing the image in the
viewfinder to be viewed from above when the camera is used to take
pictures in "wide" (landscape) orientation. Choose from magnifications
of 1× and 2×
greater precision when focusing. Diopter adjustment is also supported.
* The edges of the frame are not visible when the view is magnified.
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DR-4 Right-Angle Viewing Attachment: The DR-4 attaches to the
viewfinder eyepiece at a right angle, allowing the image in the
viewfinder to be viewed from above when the camera is used to take
pictures in "wide" (landscape) orientation.
Filters
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Neutral Color (NC) filters can be used to protect the lens.
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The camera cannot be used with linear polarizing filters. Use the C-PL or
C-PLII circular polarizing filter instead.
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Filters may cause ghosting when the subject is framed against a bright
light, or when a bright light source is in the frame. Filters can be
removed if ghosting occurs.
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RGB and 3D-RGB matrix metering may not produce the desired results
with filters with exposure factors (filter factors) over 1× (Y44, Y48, Y52,
O56, R60, X0, X1, C-PL, ND2S, ND4, ND4S, ND8, ND8S, ND400, A2, A12,
B2, B8, B12); we suggest that [Center-weighted metering] be selected
instead. See the filter manual for details.
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Filters intended for special-effects photography may interfere with
autofocus or the electronic rangefinder.
1062 Other Compatible Accessories
* , the former to view the entire frame and the latter for