Response to the zone system and the use of filters

You may be correct that a TTL meter will compensate for changes in color of the light due to the time of day. But the meter does not know the red sensitivity of the film since most films are different (see data sheets on Kodak web site). For a red or orange filter, the exposure may be off as much as 1.5 stops to begin with, before the TTL meter compensates for time of day. I have experienced this myself, especially in Colorado where there is more blue light in the shadows than many other places.

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