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"Through the Lens." Refers to flash or exposure metering which is read "through the lens," at the film or sensor plane. Nikon has further refined it into i-TTL. The TTL sensor to be found in modern Nikon DSLR and Mirrorless cameras consists of several segments dividing the image area into sections. It is mounted to measure the light reflected off the shutter. The information per segments is used for calculating the exposure.

TTL was first introduced with the great Nikon F3 SLR back in 1980 together with the SB-12 Speedlight

See also: TTL-BL and CLS

Nikonians Photo Glossary

  • This page was last modified on 13 February 2021, at 07:09.
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