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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. 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.

4. 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 ...

5. Flash (photography) - Wikipedia

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

   A full-power flash from a modern built-in or hot shoe mounted electronic flash has a typical duration of about 1ms, or a little less, so the minimum possible exposure time for even exposure across the sensor with a full-power flash is about 2.4 ms + 1.0 ms = 3.4 ms, corresponding to a shutter speed of about 1 ⁄ 290 s. However some time is ...

6. Nikon Speedlight - Wikipedia

   en.wikipedia.org/wiki/Nikon_Speedlight

   Nikon SB-400 Flash (GN 69 ft, 21 m @ 27 mm) The SB-400 is a lightweight and very compact shoe-mount flash unit, powered by only two AA-size batteries. It uses a 40 mm xenon tube. Despite its small size, SB-400 is a very capable flash with a variable angle 'bounce' head (up to 90 deg.). The head lacks tilt movement which is common to larger flashes.

7. CompactFlash - Wikipedia

   en.wikipedia.org/wiki/CompactFlash

   CompactFlash IDE (ATA) emulation speed is usually specified in "x" ratings, e.g. 8x, 20x, 133x. This is the same system used for CD-ROMs and indicates the maximum transfer rate in the form of a multiplier based on the original audio CD data transfer rate, which is 150 kB/s.