B+W 27 mm #101 Neutral Density (ND) 0.3 Glass Filter

Neutral Density filters have four main uses

• To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars

• 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

• ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2)

• ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4)

• ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8)

• ND 1.8 (exposure adjustment = approx. 6 stops, transmits 1% of light,)

• ND 3.0 (exposure adjustment = 10 stops, transmits 0.1% of light)

• ND 4.0 (exposure adjustment = 13-2/3 stops, transmits 0.01% of light)

• ND 6.0 = (exposure adjustment = approx. 20 stops)

Type

#101 Neutral Density

Size

27 mm

Grade

.3 (1-stop)

Filter Factor

Reduces ISO 1/2

Multi-Coated

No

Rotating

No

Effect

Reduce the amount of light reaching the film

Application

To use high speed films in bright sun

Color Temperature

No change

Construction

Schott Glass

Front Filter Thread Size

27 mm

Front Lens Cap Size

27 mm