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  2. Canon EOS flash system - Wikipedia

    en.wikipedia.org/wiki/Canon_EOS_flash_system

    A sensor inside the camera reads the amount of light being reflected off the film during the exposure. When the sensor determines that the exposure is sufficient, it terminates the flash pulse. A-TTL, first seen on the T90 (which predates the EOS family), is a flash exposure system that adds a brief preflash during exposure metering when the ...

  3. Canon T90 - Wikipedia

    en.wikipedia.org/wiki/Canon_T90

    The T90 was the first Canon camera to support through-the-lens (TTL) flash metering. This measures the actual light levels reaching the film by measuring reflected light off the film (OTF), shutting down the flash unit once the film is sufficiently exposed. The measurement is calculated using the average reflectivity of color negative film.

  4. Canon BG-ED3 - Wikipedia

    en.wikipedia.org/wiki/Canon_BG-ED3

    A Canon EOS 10D digital SLR with a BG-ED3 battery grip. The Canon BG-ED3 is a battery grip manufactured by Canon for certain models of its EOS digital SLR camera range. It was originally designed for the Canon EOS D30. [1] It can hold 2 BP-511 or BP-511A batteries, effectively doubling the battery life of these cameras. [2]

  5. Canon EOS 100 - Wikipedia

    en.wikipedia.org/wiki/Canon_EOS_100

    The Canon EOS 100 is a 35 mm autofocus SLR camera introduced by Canon in 1991. It was marketed as the EOS Elan in North America. It was the second camera in the EOS range to be targeted at advanced amateur photographers, replacing the EOS 650 .

  6. Through-the-lens metering - Wikipedia

    en.wikipedia.org/wiki/Through-the-lens_metering

    There were a few particularly sophisticated film SLRs including the Olympus OM-2, the Pentax LX, the Nikon F3, and the Minolta 9000, where metering cells located at the bottom of the mirror box were used for ambient light metering, depending on model either instead or in addition to metering cells in the roof of the camera. Depending on model ...

  7. Canon A-1 - Wikipedia

    en.wikipedia.org/wiki/Canon_A-1

    Canon A-1 with a FD 50/1.8 Viewfinder of a Canon A-1. The right number is the current F-number (1.8), meaning that the aperture is fairly wide open. The left number (45) indicates the approximate shutter speed of 45 −1 s (the camera can select odd shutter speeds, but does not display them)

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