Canon EOS 1Ds Mark III White Paper

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Canon EOS 1Ds Mark III White Paper Manual pdf 17 page image

IV. DISCUSSION OF NEW AND IMPROVED FEATURES 17Metering andExposure ControlCustom FunctionsHaving the same drive mechanism as the EOS-1D Mark III, the EOS-1Ds Mark III’s maxi-mum continuous shooting speed is 5 fps in both the One-Shot AF and AI SERVO AFmodes. This rate is achieved with 8-channel reading, DDR-SDRAM (twice the capacity ofthe EOS-1Ds Mark II’s), and Dual “DIGIC III” Image Processors. Continuous shootingspeed can also be adjusted with C.Fn III-16 [Continuous shooting speed] as follows:High-speed continuous within 2 to 5 fps, and low-speed continuous within 1 to 4 fps.The metering optics have the metering lens and 63-zone meteringsensor positioned at the rear of the pentaprism. The 19 AF points inthe Area AF optimally match the metering sensor’s zones.The same 4 metering modes as in the EOS-1D Mark III are provided.Partial metering covers about 8.5% of the viewfinder area at thecenter, and spot metering about 2.4% at the center.Because the metering area within the viewfinder is smaller than that of the EOS-1D Mark III,the algorithm has been optimized for the EOS-1Ds Mark III. However, the basic algorithmis the same as the EOS-1D Mark III’s.ISO bracketing is not provided in either the EOS-1Ds Mark III or the EOS-1D Mark III.With the Ec-A, Ec-B, Ec-I, and Ec-L interchangeable focusing screens, only spot meteringoutside the center and center-weighted average metering is possible. Since the prismcenters of these focusing screens are plainly transparent, an error will occur with evalua-tive metering, partial, and center spot metering.The Custom Functions are the same as the EOS-1D Mark III’s. The Custom Functionnames, settings, numbers and so forth are the same. The only exceptions are C.Fn I-3[Set ISO speed range], C.Fn I-8-2 [Safety shift: Enable (ISO speed)], C.Fn I-15-1 [Flashsync. speed in Av mode: 1/250 sec.], and C.Fn III-16 [Continuous shooting speed]. Eitherthe setting values or control values have been changed to suit the EOS-1Ds Mark III’sspecifications.* C.Fn I -7-1 enables AF point-linked spot metering.Evaluative/Center-weightedaverage metering Partial metering Spot meteringMetering SensorMetering Zones