neutral density filter

NickJones

Active Member
A gray filter that reduces all wavelengths of colors equally, achieving the effect of decreasing the intensity of the light source without changing its color temperature. Often used on gaseous discharge sources that can't be electronically dimmed.

One manufacturer's offerings, from http://www.gamonline.com/catalog/cinefilters/app.php :
ND (NEUTRAL DENSITY)
ND Filters are designed to reduce the light output of your light source without changing the color temperature. ND filters are often used on windows to reduce the brightness and balance the contrast ratio of daylight to the indoor or shadowed area.
GamColor ND filters are available in five graduated steps providing for a light loss from 1/2 stop (.15) to 4 stops (1.2).

All four gel manufacturers, Rosco, LEE, GAM, and Apollo offer various intensities. http://www.leefilters.com/lighting/t...filter=control

0.15 ND reduces light 1/2 f-stop, 75% transmission
0.3 ND reduces light 1 f-stop, 50% transmission
0.6 ND reduces light 2 f-stops, 25% transmission
0.9 ND reduces light 3 f-stops, 12% transmission
1.2 ND reduces light 4 f-stops, 6% transmission
 
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