Misha Engel
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External one.
Not according to Sony.
Built-in electronic Variable ND Filters
The FS5 features Sony’s unique built-in electronic variable Neutral Density (ND) filter, further expanding the depth of field capability of its large format sensor. Unlike conventional optical ND Filters, the electronic ND Filter on the FS5 can be controlled from 1/4 ND to 1/128 ND linearly. ND Filters can also be set to auto.* This makes the FS5 ideal for fast-moving shoots in changeable environments — there’s no need to change filters as lighting conditions change, and variable control makes it easy to keep depth of field under control.