High in the sky for much of the day, old Sol throws shadows so harsh that even run-and-gun videographers begin to wish they were traveling with a full kit of scrims, reflectors and HMI lights.
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The A and B positions allow a videographer to memorize white balance settings under two different lighting conditions and, providing that you remember which letter goes with which location, flip instantly back and forth between them without taking time to rebalance.
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