B+W Grey neutral density 4x F-Pro

Filter B+W Grey neutral density 4x

This B+W Grey neutral density 4x (102) absorbs light in the equivalent of two diaphragm points, is preferred in the photographic field.

These types of filters, also called neutral density, are used to adjust the exposure to increase the exposure time and / or open the diaphragm, either for technical or creative reasons: for example, being able to fluidly record a waterfall, instead of freezing it.