Nikon D700 - Manual (Page 89)

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d
D Auto DX Crop
The Fn button can not be used to select image area when a DX lens is
attached and Auto DX crop is on.
A The Fn, Depth-of-Field Preview, and AE-L/AF-L Buttons
Changes to image area settings can be made using the Fn button (the
default setting, see Custom Setting f5, Assign FUNC. button, pg. 320), the
depth-of-field preview button (Custom setting f6, Assign preview
button, pg. 324), or the AE-L/AF-L button (Custom Setting f7, Assign AE-L/
AF-L button, pg. 325). Note that some “button press” options can not be
combined with options using “+dials.”
A Image Size
Image size varies with the option selected for image area.