Originally Posted by dancqu
I'm sorry, but you've lost me on this. Could you elaborate? Are you talking about paper? If so 2850K is close to the ANSI standard. ISO 6 says that film speed can be determined using ISO sensitometric daylight, studio ungsten, or photoflood illuminants as long as the conditions are stated in the instuctions. BTW, under 5.3.4 Filters it states, "ISO speed does not apply to the filtered conditions."