Canon Rethinks D-SLR Auto focusing in Live View

Canon continues to expand its D-SLR update program with the launch of a replacement for the enthusiast-level EOS 60D. Not surprisingly, the EOS 70D boasts a number of key upgrades overs it predecessor, but far more significant is a whole new sensor design to deliver what Canon calls «Dual Pixel CMOS AF». The new sensor employs pixels comprising two independent photodiodes, one of which performs phase-difference detection auto¬focusing during this phase of the capture process, but both of them are subsequently employed to output an image signal. This arrangement enables 80 percent of the image to be used for autofocusing during live view and video recording.

Canon says the EOS 70D can autofocus in these situations around 30 percent faster than the EOS 100D which uses the company’s previous ‘Hybrid CMOS AF II’ system (as does the 700D). Canon also notes that the new technology delivers much smoother continuous autofocusing when shooting video.

The new sensor has an imaging area of 22.5×15.0 mm (slightly bigger than Canon’s previous ‘APS-C’ chips) while the dual pixel area is 17.9×12.0 mm. The total pixel count is 20.9 million pixels (20.

Canon’s latest-generation 14-bit DIG!C 5+ processor handles an eight channel read-out for increased speed and is claimed to be four time faster than the previous DIG Ï C 5.

The maximum continuous shooting speed is quoted at 7. With a U H S — I class card, the burst depth with JPEG/large/fine capture is quoted at 65 frames, 16 -with RAW capture.264 compression (with the choice of ALL-I or I P B methods) and stereo sound. The 70D also has a stereo audio input, auto/manual sound level control and the provision of time coding.

A conventional phase-difference detection AF module is retained and it employs 19 measuring points, all of them cross-type arrays with a sensitivity range of E V -0.5 to 18 (ISO 100). Exposure control is based on the same 63-zone ‘iFCL’ metering system now used in a number of Canon D-S L R s, and with the options of selective area, spot and centre-weighted average measuremen’s. The features list also includes multi-shot HDR capture, a multiple exposure facility, a choice of seven ‘Creative Filter effects, in-camera RAW-to-JPEG processing, in-cam- era lens corrections and a built-in Wi-Fi transceiver. The 7.7 cm ‘Clear View LCD II’ monitor screen has full tilt/swing adjustability, a resolution of 1.04 million pixels and touch controls.

Canon Australia expects the EOS 70D to be available locally from September. Published US prices suggest the 70D body will sell here for around $1199 while the single lens kit (with the EF-S 18-55mm f3.5-5.6 IS STM zoom) will be priced in the region of $1399.

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