Canon 1901B017 User Manual - Page 157
C.Fn III: Auto focus/Drive
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3 Custom Function SettingsN C.Fn II -3 Highlight tone priority 0: Disable 1: Enable Improves the highlight detail. The dynamic range is expanded from the standard 18% gray to bright highlights. The gradation between the grays and highlights becomes smoother. With setting 1, noise in the shadow areas may be slightly more than usual. With setting 1, the settable ISO speed range will be 200 - 1600. Also, the ISO speed displayed on the LCD panel and in the viewfinder, will have the "0" displayed as a smaller character such as "2oo". When the image's shooting information (p.117) is displayed, the ISO speed's "0" will also be displayed as a smaller character. C.Fn III: Auto focus/Drive C.Fn III -1 Lens drive when AF impossible If autofocus is executed, but focus cannot be achieved, the camera can either keep trying to focus or stop. 0: Focus search on 1: Focus search off Prevents the camera from becoming grossly out of focus as it attempts to focus again. Especially convenient with super telephoto lenses which can become extremely out of focus. 157