A gray filter that reduces all wavelengths of colors equally, achieving the effect of dimming the light source without changing its color temperature.
One manufacturer's offerings, from http://www.tlsinc.com/toolfilterfax.html:
All four gel manufacturers, Rosco, LEE, GAM, and Apollo offer various intensities. http://www.leefilters.com/lighting/technical-list.html#&filter=control
Lee # - Desc - F-stop - Transmission - Roscolux - ApolloGel
Lee 298 - 0.15ND - reduces light 1/2 stop - 70% transmission - Roscolux 397 - no equivalent
Lee 209 - 0.3ND - reduces light 1 stop - 50% transmission - Roscolux 97 - Apollo 2310
Lee 210 - 0.6ND - reduces light 2 stops - 25% transmission - Roscolux 98 - Apollo 2320
Lee 211 - 0.9ND - reduces light 3 stops - 13% transmission - Roscolux 97 - Apollo 2330
Lee 299 - 1.2ND - reduces light 4 stops - 6% transmission - no equivalent - no equivalent
One manufacturer's offerings, from http://www.tlsinc.com/toolfilterfax.html:
All four gel manufacturers, Rosco, LEE, GAM, and Apollo offer various intensities. http://www.leefilters.com/lighting/technical-list.html#&filter=control
Lee # - Desc - F-stop - Transmission - Roscolux - ApolloGel
Lee 298 - 0.15ND - reduces light 1/2 stop - 70% transmission - Roscolux 397 - no equivalent
Lee 209 - 0.3ND - reduces light 1 stop - 50% transmission - Roscolux 97 - Apollo 2310
Lee 210 - 0.6ND - reduces light 2 stops - 25% transmission - Roscolux 98 - Apollo 2320
Lee 211 - 0.9ND - reduces light 3 stops - 13% transmission - Roscolux 97 - Apollo 2330
Lee 299 - 1.2ND - reduces light 4 stops - 6% transmission - no equivalent - no equivalent
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