Canon XSI Kit EOS DIGITAL REBEL XSi/EOS 450D Instruction Manual - Page 156

3 Custom Function SettingsN C.Fn-5 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 in the viewfinder, will have the "0" displayed as a smaller character such as "2oo". When the image's shooting information (p.131) is displayed, the ISO speed's "0" will also be displayed as a smaller character. C.Fn-6 Auto Lighting Optimizer 0: Enable If the image comes out too dark or the contrast is too low, the image brightness and contrast are corrected automatically. (Depending on the shooting conditions, image noise may increase.) This function will not work with manual exposures nor 1 and 1+73 images. In the Basic Zone modes, the Auto Lighting Optimizer will operate automatically. B 1: Disable 156