Nikon D700 - Manual (Page 94)

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❚❚The NEF (RAW) Recording Menu: NEF (RAW) Bit Depth
The NEF (RAW) recording > NEF (RAW) bit depth item in the
shooting menu offers the following bit-depth options for NEF
(RAW) images:
A NEF (RAW) Images
Note that the option selected for image size does not affect the size of NEF
(RAW) images.
When opened in software such as Capture NX 2 (available
separately) or ViewNX (supplied), NEF (RAW) images have the dimensions
given for large (L-size) images.
Option Description
q
12-bit
(default)
NEF (RAW) images are recorded at a bit-depth of 12 bits.
r
14-bit
NEF (RAW) images are recorded at a bit-depth of 14 bits,
producing files larger than 12-bit files but increasing the
color data recorded.