Canon EOS 1D Mark III User Guide - Page 11

noise, the EOS-1D Mark III has a new feed-through output amp that attains both high speed and low noise. Low noise is also achieved with an improved manufacturing process, an optimized pixel amp and an optimized reading circuit. As with the EOS-1D Mark II N, single-line, 8-channel reading is employed. With a faster output amp and optimized read circuit, a continuous shooting speed of approximately 10 fps is attained. Time To minimize the higher power consumption required by the faster signal reading, the output amp's power consumption has been reduced. Also, as in the EOS-1D Mark II N, during long exposures, power to the output amp is turned off and the standard current driving the circuit is also cut off to save power. In addition, during Live View shooting, the power distribution for the signal-reading operation is optimized for more pinpoint power-saving control. Previously, in front of the sensor, there was an infrared-absorption glass integrated with a three-layer, optical crystal plate for point image separation. However, for the Self Cleaning Sensor Unit, the infrared-absorption glass is now separate from the three-layer, optical crystal plate. This makes the dust-shaking plate lighter, saving power and making it easier to control. The infrared filter has a hybrid construction; it has an infraredabsorption glass with multiple coatings to reflect infrared and ultraviolet rays, the same construction found in EOS-1D series cameras. It effectively reduces red fringing and color casts caused by reflections of the sensor surface. The low-pass filter for point image separation has a phase plate (which converts linear polarization to circular polarization) sandwiched by two single crystal plates. It is optimized for the sensor pitch so the light flux is separated into the horizontal and vertical directions and the fine horizontal- and vertical-line patterns are cleanly separated, effectively reducing color artifacts such as moiré. Dichroic mirror (Reflects infrared rays) Infrared-absorbing glass CMOS sensor Low-pass filter (Separates image in vertical direction) Phaser layer (Converts linear polarized light into circular polarized light) Low-pass filter (Separates image in horizontal direction) Dual DIGIC III Image Processors DIGIC II, a high-performance imaging engine that has been used since the EOS-1D Mark II in 2004, has been a major feature of Canon digital cameras because of its very fine image detail, natural color reproduction and high-speed signal processing. DIGIC III retains the DIGIC II's basic concept and improves upon it with higher performance and faster speed. To cope with the voluminous signal processing required by the EOS-1D Mark III's 10.10 megapixels and top continuous shooting speed of 10 fps, Dual DIGIC III Image Processors are incorporated for parallel signal processing. The CMOS sensor reads out to the dual DIGIC III Image Processors simultaneously in 8 channels. III. IMAGE QUALITY IMPROVEMENTS 11