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16mm Optical sound is hard to get right. You have 30-40dB of dynamic range to work with, no automatic gain control, and horrible distortion when it clips.
Plus if you actually attached the mic to the camera, all you would hear is how noisy the camera is. The sound guy would keep the gain adjusted properly, move the mic around, etc. Plus in the tube days the amplifier for optical sound was a big heavy affair with very expensive batteries.
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