Nikon D700 User Manual page 402

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Calculating Picture Angle
The 0700 can be used with Nikon lenses for 35mm (135) format cameras.
If Auto OX crop is on (the default setting) and a 35mm format lens is
attached, the picture angle will be the same as a frame of 35mm film
(36.0
x
23.9 mm); if a OX lens is attached, the picture angle will
automatically be adjusted to 23.5
x
15.6 mm (OX format).
To choose a picture angle different from that of the current lens, turn Auto
OX crop off and select FX format (36 x 24) or OX format (24 x 16). If a
35 mm format lens is attached, the picture angle could be reduced by
1.5 x by selecting OX format (24 x 16), exposing a smaller area.
Lens
FX
format
(36
x 24)
picture size (36.0
x
23.9 mm,
equivalent to 35mm format camera)
Picture diagonal
~ - - - - _ . _ - - - - -
OX
format (24 x
16) picture size
(23.5 x 15.6 mm, equivalent to
OX
format camera)
Picture angle (FX
format
(36
x 24);
35mm format)
Picture angle (OX
format (24 x
16);
OX
format)
' - - - - - - - - - - - - - - - - - - - - - - - - - - -
The OX format (24 x 16) picture angle is about 1.5 times smaller than the
35mm format picture angle. To calculate the focal length of lenses in
35mm format when OX format (24 x 16) is selected, multiply the focal
length of the lens by about 1.5 (for example, the effective focal length of a
50mm lens in 35mm format would be 75 mm when OX format (24 x 16)
I.-I
is selected).
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