Sony NEX-FS700R NXCAM Handbook page 13

Internal ND filter
The NEX-FS700R features a new internal ND filter unit designed to suit the
shorter flange back on the E mount lens. No longer is it necessary to carry several
different ND filters to suit different lens filter diameters.
ND filters are used to limit the light volume in bright environments without closing
the aperture. This is used to achieve shallow depth of field even in daylight
outdoor settings, or to reduce the shutter speed to prevent parabolic effect.
Settings
Clear (= OFF), 1/4 (2EV), 1/16 (4EV), 1/64 (6EV)
ND filter correction
The 1/4 ND filter reduces the light volume to 25%, equivalent to closing the
aperture two stops (e.g., from F2.8 to F5.6) or increasing the shutter speed by
two increments (e.g., from 1/125 to 1/500).
The 1/16 ND filter is equivalent to four aperture stops, while the 1/16 is
equivalent to six aperture stops or shutter speed increments.
When using a strong ND filter to produce a "bokeh" effect via exposure correction, depth of field will be extremely shallow in
the telephoto range, which may affect focus performance on moving subjects.
Significantly altering the aperture and shutter speed can affect the background "bokeh" effect and make movement appear
brittle. ND filters can be used to enhance fluidity.
ND filters are particularly effective for certain lenses where contrast levels and image resolution tend to suffer at maximum
aperture.
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