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How to use the AF-Assist Beam and what is its coverage on the 430EX II Speedlite
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Under low-light or low-contrast conditions , the built-in AF-assist beam will be emitted automatically to make it easier to autofocus. The 430EX II's AF- assist beam is compatible with the AF points of almost all EOS cameras. The AF-assist beam is compatible with 28mm and longer lenses.
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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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How to set and use the Custom Function Settings "C.Fn" on the 430EX II Speedlite
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Custom Function Settings C.Fn-02-113: Convenient when you want to use the depth-of-field preview button to check the depth of field. C.Fn-08: If the Speedlite or camera's AF- assist beam is disabled, the AF- assist beam will not be emitted.
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580EX II Speedlite : How to set and use the Custom Function Settings "C.Fn"
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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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How to set the communication channel on the 430EX II Speedlite.
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When the receiver unit (s) is ready to fire (fully charged), the AF- assist beam will blink at 1-sec intervals
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QuickGuide to Canon 270EX II Speedlite Features
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The mode you choose will depend mainly on the balance you prefer between the flash exposure and the ambient light exposure. Longer shutter speeds will allow longer ambient light exposures to help prevent dark backgrounds; however, long exposures also risk blur from subject or camera motion. Smaller apertures provide more depthof-field but require more flash power and reduce the maximum flash range.
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Explanation of AF assist beam operation
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430EX 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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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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MR-14EX : How to turn on the Focusing Lamps.
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In low-light or when the viewfinder image gets darker at high magnification, it becomes difficult to achieve correct focus. In such cases, the focusing lamp can assist with focusing.
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