Frequently Asked Questions
Why convert Kelvin to mireds?
Equal mired steps produce equal visible color shifts, so a filter rated in mireds gives a consistent effect no matter the starting temperature. Kelvin differences are not perceptually even.
What does a positive mired shift mean?
It means your target is warmer, at a lower Kelvin, than your source, so you need an amber warming filter such as an 81-series gel or CTO.
How do I cool a light source?
A negative mired shift calls for a blue cooling filter, such as an 82-series gel or CTB, to raise the apparent color temperature toward daylight.
Does this account for green or magenta tint?
No. Mireds describe only the warm-to-cool color temperature axis. Green and magenta tint is a separate correction handled with plus-green or minus-green gels.
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