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CMS-XML Reset C.Fn-5 is set to 0 (E-TTL).
Do not set it if you have an EOS Digital camera or the EOS Rebel T2/300 X . ... If "AF- assist beam OFF" is set with the Speedlite or camera, the AF- assist beam will not be emitted.
CMS-XML Added Control with Speedlite 470EX-AI's Personal Functions
... not have ever scratched the surface of ... And, as just mentioned above, this can help avoid possible errors if you are working in larger venues, where walls may be distant and not immediately behind the photographer. ... P.Fn 04 — AF- assist beam method ... This Personal Function controls which type of focus- assist beam will be used, when it’s mounted directly on an EOS camera, and One-Shot AF is active on the camera.
CMS-XML Explanation of AF assist beam operation
CMS-XML 220EX Speedlite : How to use the AF-Assist Beam and what is its coverage
How to use the AF- Assist Beam and what is its coverage
CMS-XML Specifications of the 550EX Speedlite.
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
CMS-XML How to access Programs and Features (to uninstall programs) in Windows 8
On your keyboard, hold the windows key and press " X ". Click Programs and F
CMS-XML MR-14EX : How to turn on the Focusing Lamps.
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.
CMS-XML 540EZ Speedlite : How to use M (Manual Expose) with TTL Autoflash with Type -B cameras.
Set the camera's shooting mode to manual exposure mode (M), then set the desired aperture value and a shutter speed between 30 sec. and the camera's X -sync speed. Make sure the TTL indicator is displayed in the flash unit's LCD panel
CMS-XML List of custom functions available on the 430EX Speedlite.
C.Fn-04 AF- assist beam OFF 0
CMS-XML QuickGuide to Canon 270EX II Speedlite Features
Flash Control via the Camera Menus Any control of the Speedlite 270EX II beyond simple automatic E-TTL exposure requires a camera body with External Flash Control Menu capability, such as the EOS 40D - 60D; Rebel XS/XSi, T1i, T2i, T3, T3i; EOS 7D, 5D Mark II, EOS-1D Mark III / Mark IV, and EOS-1Ds Mark III (as of mid-2011).