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List of custom functions available on the EOS 20D and EOS 5D.

C .Fn-05 AF- assist beam You can set the AF-assist beam to be emitted from the camera or EOS-dedicated Speedlite. 0: Emits

Specifications for the Speedlite 580EX Flash

Wireless Flash Indoors: 8 - 10 m / 26.2 - 32.8 ft. Reception angle: +/- 40 degrees horizontal, +/- 30 degrees vertical Controllable receiver groups 3 (A, B, and C ) Flash ratio control 1:8 - 1:1 - 8:1 in 1/2-stop increments receiver-ready indicator AF- assist beam blinks Modeling flash Fired with camera's depth-of-field preview button

Set the Minimum Shutter Speed for Auto ISO - EOS-1D C or EOS-1D X

Setup procedure If your product issue was not resolved after following the steps above, or if you require additional help , please create or log in to your Canon Account to see your technical support options. Or if you still need help, visit our Canon Community by clicking the button below to get answers:

Registering Custom Shooting Modes to C1/C2/C3 on the Camera’s Mode Dial (EOS 5DS / EOS 5DS R)

AI Servo 1st image priority, AI Servo 2nd image priority Lens electronic MF, AF- assist beam firing, One-Shot AF release priority Lens drive when AF impossible, Selectable AF point, Select AF area selection mode, AF area selection method, Orientation linked AF point, Initial AF point,

Canon : Product Manual : EOS REBEL T8i / EOS 850D : Custom Functions (C.Fn)

C.Fn II: Autofocus/Drive Under low light, where external Speedlites for EOS cameras automatically emit an AF- assist beam, AF points are selected automatically based only on AF information. (Information on recognized people is not used for AF.)

AF-assist beam firing

AF- assist beam firing

This is the Auto Focus Assist.

This is the Auto Focus Assist .

This is to aid in autofocus.

Feature Guide and Help System on the EOS 6D.

How the AF Assist beam on the EOS Digital Rebel XSi works.

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