Tuesday, February 17, 2009
Straight To Video
The newest evolution in D-SLR technology has finally brought us high-definition video and stills in one camera. Here’s a look behind the scenes.
Extension Of Live View
Video in D-SLRs is an extension of an already familiar concept, Live View, which was first introduced to the market in 2006. D-SLR technology has since advanced to where data can be captured and passed along to the image sensor quickly enough to provide smooth HD video quality. In the case of the Canon EOS 5D Mark II, a new 21.1-megapixel, full-frame CMOS image sensor outputs image data at high speeds to the DIGIC 4 processor, more powerful than its predecessor, so it can process the information quickly enough to churn out 1920x1080-resolution HD video at 30 fps.
In the Nikon D90, a 12.3-megapixel, DX-format CMOS sensor provides high-speed, multi-channel readout directly into the EXPEED image-processing pipeline, and the live data stream is recorded and saved to an SD/SDHC memory card. When asked why video capture is comparatively late to the show since Live View has existed in the market for quite some time, Lindsay Silverman, Senior Technical Manager at Nikon, points out that the careful coordination of mirror movement and Live View video recording is a challenge to manufacture, especially when considering that photographers use their cameras differently than camcorder shooters.
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