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An example of non linear Kelvin changes, mired shifts on the move. For those of you who went to Photography school or took my class should remember M=1000000 over T. For a refresher, leefilters.com has a mired shift calculator. Mired shift measurement is more accurate if you know the color temp of the source. If I wanted to even out these three temp areas I would use filters that a mired shift calculator would tell me. Just for example, placing a 1/2 CTB (blue) on a tungsten source the kelvin shifts 900k to 4100K. (from 3200K) If you want to know more about mired shifts you can visit rosco.com.