Hoya 37 mm Neutral Density (4x) Glass Filter - Multi-Coated

Neutral Density filters have four main uses

• To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background

• To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations

• To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure

Neutral Density factors:

• NDx2 (exposure adjustment = 1 stop, reduces ISO 1/2)

• NDx4 (exposure adjustment = 2 stops, reduces ISO 1/4)

• NDx8 (exposure adjustment = 3 stops, reduces ISO 1/8)

Size

37 mm

Grade

4x

Filter Factor

+2 stops (reduces ISO 1/4)

Multi-Coated

Yes

Rotating

No

Effect

To use fast film in bright sunshine

Application

Nature

Color Temperature

No change

Construction

Glass

Front Filter Thread Size

37 mm

Front Lens Cap Size