Nikon D6 User Manual With Warranty page 208

D Calculating Angle of View
The camera can be used with Nikon lenses for 35 mm format cameras. If a
35 mm format lens or a lens that supports the FX format is attached, the
angle of view will be the same as a frame of 35 mm film.
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You can also take pictures at angles of view that differ from that of the
current lens by selecting different options for [Image area] > [Choose
image area] in the photo shooting menu. For example, if a 35 mm
format lens or a lens that supports the FX format is attached, you can
reduce the angle of view by selecting [DX (24×16)].
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The picture diagonal for 35 mm format is about 1.5 times that of the [DX
(24×16)] crop. Selecting [DX (24×16)] therefore multiplies the apparent
focal length of 35 mm format lenses attached to the camera by about
1.5×. For example, selecting [DX (24×16)] when a lens with a focal
length of 50 mm is attached increases the apparent focal length to
about 75 mm.
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Compatible F Mount Lenses
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Lens
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[FX (36×24)] picture size (35.9
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× 23.9 mm, equivalent to
35 mm format camera)
[DX (24×16)] picture size (23.5
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× 15.7 mm)
Picture diagonal
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[FX (36×24)] angle of view (35
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mm format)
[DX (24×16)] angle of view
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