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2. Flash comparison - Wikipedia

   en.wikipedia.org/wiki/Flash_comparison

   Built in wide flash adapter and bounce card. Nikon SB-80DX AF Speedlight 14m (at 18mm) / 50m (at 85mm) at ISO100 Screwlock PC 14 - 105mm 1/1 - 1/128 TTL yes yes 3sec yes Built in wide flash adapter and bounce card. Nikon SB-800 AF Speedlight [42] 38 (at 35mm) / 56m (at 105mm) at ISO100 Screwlock PC 24-105mm 1/1-1/128 i-TTL/CLS yes yes 6sec yes [43]

3. Canon EOS flash system - Wikipedia

   en.wikipedia.org/wiki/Canon_EOS_flash_system

   Evaluative-Through The Lens (E-TTL) is a Canon EOS flash exposure system that uses a brief pre-flash before the main flash in order to obtain a more correct exposure. Unlike TTL and A-TTL metering, which use a dedicated flash metering sensor mounted in the base of the mirror box, E-TTL uses the same evaluative metering sensor used for ambient ...

4. Flash (photography) - Wikipedia

   en.wikipedia.org/wiki/Flash_(photography)

   Video demonstration of high-speed flash photography. A flash is a device used in photography that produces a brief burst of light (lasting around 1 ⁄ 200 of a second) at a color temperature of about 5500 K [1] [citation needed] to help illuminate a scene. The main purpose of a flash is to illuminate a dark scene.

5. Pentax *ist DS - Wikipedia

   en.wikipedia.org/wiki/PENTAX_*ist_DS

   Along with the other D-series Pentax DSLRs, the Pentax *ist DS, Pentax *ist DS2, and Pentax *ist D have TTL-mode (not only P-TTL) for external flash. This allows the photographer to use cheaper TTL flashes rather than the current offerings from Pentax and Samsung with 'pre-flash' operation, which can cause some subjects to blink.

6. Through-the-lens metering - Wikipedia

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

   When using rear-curtain flash (when the flash fires at the end of the exposure) and a slow shutter speed, the distinction between the main flash and the preflashes is more obvious. [5] Some cameras and flash units take more information into account when calculating the necessary flash output, including the distance of the subject to the lens.

7. Hot shoe - Wikipedia

   en.wikipedia.org/wiki/Hot_shoe

   The flash unit sets up a circuit between shoe and contact—when it is completed by the camera, the flash fires. In addition to the central contact point, many cameras have additional metal contacts within the "U" of the hot shoe. These are proprietary connectors that allow for more communication between the camera and a "dedicated flash".