body resembles that of Nikon's F-series 35mm cameras, complete with dials for shutter speed, aperture, and exposure compensation as well as shutter release with the old screw-thread cable release capability
the ISO and exposure compensation dials are individually lockable but require vision to do so which may limit their utility
the 'lift to unlock' PASM selector dial is especially awkward to operate with eye to viewfinder
the shutter dial only shows full EV increments down to 4 sec, so if you need longer exposures or finer changes, then you must set it to 1/3 step and use the front dial instead.
but no mirror lockup lever and no interchangeable focusing screen so no split-prism screen to enhance manual focus, and no EVF to allow focus peaking or live image stabilised magnified view
and if your CPU lens has an aperture ring it must be locked to the smallest aperture 'auto' setting, and you cannot use the ring directly to set aperture.
but like other modern high-end Nikon DSLRs, up to 9 'non-CPU' lenses can be programmed in for use with the Df. When one of these is attached, aperture is adjusted using the dedicated ring on the lens.
and you can also attach very old, pre-Ai (automatic indexing) lenses as the Ai indexing tab around the lens throat can be folded out of the way, to allow these older non-Ai lenses to mount without jamming. For metering to work with these lenses you must set the camera aperture AND the lens aperture to the same aperture manually.