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Specifications of the 430EX Speedlite.
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For high sync speed (EF flash): Approx. 2.3-39.4 ft./0.7-12 m AF Assist Beam
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QuickGuide to Canon 270EX II Speedlite Features
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To facilitate autofocus for dark scenes, the 270EX II may fire repeatedly when you press the camera’s shutter button halfway. Its maximum AF- Assist range is approximately 4 m /13.1 ft., depending on the ISO setting and maximum aperture of your lens.
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Specifications of the 550EX Speedlite.
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Direct- sync, shoe-mount flash with E -TTL/TTL autoflash control and wireless transmission/reception ( E -TTL preflash, AF- assist beam, auto zoom, and bounce flash). Compatible Cameras
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Explanation of AF assist beam operation
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AF-Assist Beam The AF- assist beam will sometimes emit when the shutter button is pressed halfway to assist focusing in certain conditions, i. e . dark conditions.
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QuickGuide to Macro Speedlite MR-14EX and MT-24EX
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P, Av, Tv, or M . Choose Manual mode when you want small apertures for maximum depth-of-field combined with a fast shutter speed to help minimize blur and separate the subject from the background. (Light falls off more rapidly at short distances, therefore the closer the flash is to the subject, the darker the background exposure will be unless you either increase the shutter speed/ambient light exposure or light the background separately.)
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How to use the AF-Assist Beam and what is its coverage on the 320EX Speedlite
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] during Live View shooting or movie shooting. The effective range is approximately 4 m 1 13.1 ft. This function only works when used with an EOS digital camera with an external Speedlite control function.
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The camera show E in Creative Zone when using the 580EX II
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If "AF- assist beam 0FF" is set with the Speedlite or camera, the AF assist beam will not be emitted . With Type-B cameras, even if .Fn-05-0 is sat, E-TTL II / E-TTL autoflash will not work,
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Reset C.Fn-5 is set to 0 (E-TTL).
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With Type-A cameras, if C.Fn-05-1 is set, wireless autoflash shooting will not be possible If "AF- assist beam OFF" is set with the Speedlite or camera, the AF- assist beam will not be emitted. With Type-B cameras, even if C.Fn-05-0 is set, E-TTL II/E-TTL autoflash will not work
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QuickGuide to Speedlite Transmitter ST-E3-RT Setup
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5. Confirm that the <LINK> lights on the sender and receivers are lit and green and that the AF- assist beam emitter on the receiver is blinking at 1-second intervals. Also confirm that the red pilot lamp (ready-light) on the ST-E3-RT is illuminated.
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220EX Speedlite : How to use the AF-Assist Beam and what is its coverage
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How to use the AF- Assist Beam and what is its coverage
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