Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 164

3 Custom Function Settings 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 top LCD panel and in the viewfinder, will have the "0" displayed as a smaller character such as "2oo". When the image's shooting info (p.117) is displayed, the ISO speed's "0" will also be displayed as a smaller character. C.Fn II -4 E-TTL II flash metering 0: Evaluative flash metering Fully automatic flash photography for all conditions, from low light to daylight fill-flash. 1: Average flash metering The flash is averaged for the entire area covered by the flash. Since automatic flash exposure compensation will not be executed, you may have to set it yourself depending on the scene. This also applies if you use FE lock. C.Fn II -5 Shutter curtain sync. 0: 1st-curtain synchronization 1: 2nd-curtain synchronization The flash fires right before the shutter closes. When a slow shutter speed is set, you can capture a light trail following the subject. This Custom Function can be used to obtain 2nd-curtain sync effects even with EX-series Speedlites which do not have this feature. If the EX-series Speedlite has this feature, it will override this Custom Function's setting. With setting 1, a preflash will be fired for flash metering control right after you press the shutter button completely. Remember that the main flash will then fire right before the shutter closes. 164