Focus ramping: when T-stops go bad by Art Adams - ProVideo Coalition
Years ago, while assisting on a sitcom, I helped the director of photography shoot exposure tests on all of our zooms. The closeups were darker than expected, and she wanted to know why. The two master cameras used 5:1 zooms, and the two wing cameras used 10:1 zooms. Our tests showed that the 10:1 zooms...
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