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The Speedlite 550EX, 580EX, 580EX II and the 600EX-RT flashes (when used as a master flash) use modulation of the pre flash from the main flash tube for communicating with slave flashes. The ST-E2 also uses a modulated flash tube for this purpose, but it is fitted with a near infra-red filter (it serves no other purpose).
Pages in category "Canon flashes" ... changes. C. Canon EOS flash system; S. Canon Speedlite; Speedlite 420EX; Speedlite 430EX; Speedlite 430EX II; Speedlite 550EX ...
Yes (only when using Canon master) Yes Canon Speedlite 580EX II [5] 58m/190 ft at 105mm zoom-head position Yes 24-105mm (14mm diffusor) 1/1-1/128 (1/3 steps) E-TTL II yes yes (360) 3.5 sec Yes (only when using Canon master) Can be used as wireless (optical) controller for other Canon flashes Yes Canon Speedlite 600EX-RT [6]
Canon Speedlite, a Canon brand of electronic flashes for their EOS camera system; Ricoh Speedlite, a Ricoh brand of electronic flashes; See also.
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 ...
The presence of separate Speedlite 430EX and 430EX II articles is certainly unnecessary. Even lens articles cover multiple generations in one article (Canon EF 50mm lens and Canon EF 28-80mm lens for instance). —/Mendaliv/ 2¢ / Δ's / 20:30, 16 April 2010 (UTC) Merge These need to be merged. I'm contemplating how it will be done.