The Kenko Color Meter KCM-3100 helps to ensure consistent results when taking color photographs using either ambient or flash light. It measures the light illuminating the subject and determines the filtration required to reproduce subject colors correctly. Readings are provided for both light-balancing filters and color-compensating filters. In addition, the photographic color temperature of the illumination can also be displayed. The meter can be set to determine the required filters for any of three film types: Daylight (balanced to 5500K), Type-A Tungsten (balanced to 3400K), or Type-B Tungsten (balanced to 3200K). Either ambient or flash measurements can be taken. Ambient measurements can be taken under illumination levels from EV3 to EVI6.3 at ISO 100. Flash measurements can be taken for flash power levels corresponding to apertures of from f/2.8 to f/180 (at ISO 100): they can be taken with or without a sync cord, and shutter speeds from 1 /500 to1 sec. can be selected. For flash measurements, the meter measures the mixed flash and ambient light, since this is what will actually illuminate the subject, at the selected shutter speed. After measurement, the shutter speed can be changed, effectively changing the ratio of flash to ambient light: by noting the change in required filtration, you can predict the effect on the image color. In addition, the Color Meter KCM-3100 can subtract out the ambient light to display the results for only the light from the flash. To allow you to adjust the meter to your color preferences, correction values can be set in any of the meter's nine memory channels. Once these values have been set, the meter will automatically adjust measurement calculations to ensure that colors are reproduced according to your expectations.