Formatt BF 77-ND.6HD Neutral Density ND 0.6 77mm Filter

Formatt BF 77-ND.6HD Neutral Density ND 0.6 77mm Filter, known as NDs, these filters produce a grey neutral tone and are used to reduce light, enabling more control over exposure and depth of field without affecting color or contrast. They are especially useful in bright light conditions to avoid over exposure.
When using wider lenses they adjust exposure correctly, allowing for reduced depth of field. This enables highlighting of the principal subject and taking the foreground or background out of focus.
NDs are made in different grades according to the level of light reduction.

The standard grades are 0.3, 0.6, 0.9 and 1.2 which equate to 1, 2, 3 and 4 stops of light reduction.