Kodak 4 x 4" Neutral Density (ND) #96 0.9 Optical Gelatin Wratten Filter

Wratten 2 Improvements

• More rigid/durable

• Easier to handle

• Color consistent today, and 6 months from now as well

• Wratten 2 Optical Filters are less sensitive to humidity, less prone to static cling

• Fingerprint removal is also easier

• Most Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6" (150 x 150mm), and 14 x 18" (350 x 450mm)

• These filters are available in increments from 1/3 stop to 13.33 stops exposure reduction

Neutral Density filter 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 that could cause overexposure.

Neutral Density factors

• ND .10 (exposure adjustment = 1/3 stop)

• ND .20 (exposure adjustment = 2/3 stop)

• ND .30 (exposure adjustment = 1 stop)

• ND .40 (exposure adjustment = 1 1/3 stops)

• ND .50 (exposure adjustment = 1 2/3 stops)

• ND .60 (exposure adjustment = 2 stops)

• ND .70 (exposure adjustment = 2 1/3 stops)

• ND .80 (exposure adjustment = 2 2/3 stops)

• ND .90 (exposure adjustment = 3 stops)

• ND 1.0 (exposure adjustment = 3 1/3 stops)

• ND 2.0 (exposure adjustment = 6 2/3 stops)

• ND 3.0 (exposure adjustment = 10 stops)

• ND 4.0 (exposure adjustment = 13 1/3 stops)