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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).
Yes (only when using Canon master) Yes Canon Speedlite 580EX II [5] ... 0.1 to 3 sec for normal flash, 0.1 to 3 sec for quick flash [38] no ...
Pages in category "Canon flashes" ... changes. C. Canon EOS flash system; S. Canon Speedlite; Speedlite 420EX; Speedlite 430EX; Speedlite 430EX II; Speedlite 550EX ...
Canon J II (1946) Similar if not the same as prewar cameras; Canon S (1946) Similar if not the same as prewar cameras; Canon S II (1946) A redesign with combined range finder and viewfinder functions – two windows; Canon II B (1949) Canon II C (1950) Canon III (1951) Canon IV (1951) Canon III A (1951) Canon IV S (1952) Canon II A (1952) Canon ...
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Guide number distances are always measured from the flash device to the subject; if the flash device is detached from the camera, the position of the camera is irrelevant. Furthermore, unless a flash device has an automatic zoom feature that follows the setting of a camera's zoom lens, guide numbers do not vary with the focal length of lenses.