2183 Custom Function SettingsC.Fn III: Autofocus/DriveC.Fn III -1 USM lens electronic MFThe USM lens electronic MF can be enabled or disabled when you use anyof the following lenses.EF50mm f/1.0L USM, EF85mm f/1.2L USM,EF85mm f/1.2L II USM, EF200mm f/1.8L USM,EF300mm f/2.8L USM, EF400mm f/2.8L USM,EF400mm f/2.8L II USM, EF500mm f/4.5L USM,EF600mm f/4L USM, EF1200mm f/5.6L USM,EF28-80mm f/2.8-4L USM0: Enable after One-Shot AFAfter focus is achieved in One-Shot AF, electronic MF is enabled. If C.FnIV -1-2/3 is set, it is also enabled before focus is achieved.1: Disable after One-Shot AFAfter focus is achieved in One-Shot AF, electronic MF is disabled. IfC.Fn IV -1-2/3 is set, it is possible before focus is achieved.2: Disable in AF modeElectronic MF is disabled in the AF mode.C.Fn III -2 AI Servo tracking sensitivityDuring focusing in AI Servo AF mode, the AF sensitivity for tracking subjects (orobstacles) moving into the AF points can be set to one of five levels.If it is set toward [Slow], interruptions by any obstacles will be lessdisruptive. It makes it easier to keep tracking the target subject.If it is set toward [Fast], it will be easier to focus any subject which suddenlyenters the picture from the side. Convenient when you want to successivelyphotograph multiple subjects located at random distances.C.Fn III -3 AI Servo 1st/2nd image priorityWhen AI Servo AF is used with continuous shooting, you can change theServo’s operation characteristics and shutter-release timing.0: AF priority/Tracking priorityFor the first shot, focusing the subject is given priority. For the second and followingshots during continuous shooting, focus-tracking of the subject is given priority.1: AF priority/Drive speed priorityFor the first shot, focusing the subject is given priority. During continuous shooting,the continuous shooting speed is given priority over the focus-tracking of the subject.COPY
