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When you hit the “Auto Balance” button the software will average the white balance across all of
the points you selected. The image will update to show the new white balance.
It is important to understand that the color balance interacts with the ISO settings somewhat. The
auto balance button looks at the targets you have selected and calculates the necessary gain
adjustments to the CCD to balance the color. If the light source deviates drastically from the
expected color temperature (3200K for Tungsten and 5600K for Daylight.) for your IR filter then you
will force the gain to be adjusted more drastically. This will result in a reduced maximum ISO. For
example if you are in a candlelit room and you try to white balance to neutral you will end up with
a very limited maximum ISO because the camera has to push the green and blue channels so hard
to match the red channel. You will likely see more noise in such an over corrected setting. In this
case it would probably be a better strategy to use the tungsten IR filter and use the default tungsten
color balance and let the scene go warm. After all… Candles look very warm. Or you could add
additional glass color correction filters to bring the candlelight closer to 3200K.
Summary of Contents for MARK TWO
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