Always meter negative film in a way that you are sure the shadow point of your images preserve some detail. Highlights can be overexposed by a dozen stops and still be scanned to retain detail. With a handheld incident meter, point your meter away from the main light source and make a minimum exposure reading. With in camera or spot meter take your minimum exposure reading from the darkest tone in your scene. Anything exposed under that should be expected to remain void of detail.
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