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TTL meter

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noun Photography.
  1. through-the-lens meter.
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through-the-lens meter

[throo-thuh-lenz]
noun Photography.
  1. a light meter employing a sensor cell located behind the taking lens.
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Also called TTL meter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018