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Christmas Gift Guide

No radical design changes

Streamlined layout

Dual card slots

Menus

Locking mode dial

Status LCD and top controls

Connectors

Redesigned battery grip

New flagship flash

Just the flash transmitter

GPS receiver

While Canon made a lot of little--and important--tweaks to the camera's design, physically it feels fundamentally the same as its predecessor.
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The back controls have been moved around a little for more streamlined operation. These include a 7D-like button/switch for Live View and movie capture and the addition of a touch pad to the control dial for silent adjustments during movie shooting. The viewfinder now offers 100 percent coverage, and the camera incorporates the same 3.2-inch LCD that Canon's using in all its current high-end dSLRs.
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Not only is it great that the camera has both CF (UDMA 7) and SDXC card slots, but it adds a nice twist to the more common myriad options for them: you can also configure to save say, large raw files to one and small to the other, or differently compressed JPEGs to each.
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The 5DM3 uses the same menu and control-configuration system as the 1D X, which in turn copies some of the 7D. I've always found this screen for configuring the various controls extremely well designed.
Caption by / Photo by Lori Grunin/CNET
Canon adds a locking mode dial to the camera, which is good, but it's the awkward center button that debuted in the 60D.
Caption by / Photo by Lori Grunin/CNET
The status LCD is the same, although it has a few more readouts to accommodate some of the new features, like silent burst shooting. There's also a tiny new programmable button on top. The other controls--metering, white balance, AF mode, drive mode, ISO, and flash compensation, as well as AF lock, AD lock, and focus-area selection--remain unchanged.
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Canon adds a headphone jack to its set of connectors. Unfortunately, the HDMI still outputs only with screen overlay.
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While both the camera and the optional vertical grip use the same batteries as the 5DM2, the grip has been slightly redesigned to add a jog controller for improved vertical handling. There's also a duplicate of the manual function button by the shutter.
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The 580EXII is getting replaced by the Speedlite 600EX-RT, Canon's first flash with built-in wireless master capability (it supports RF or line-of-sight for backward compatibility). It supports up to five groups flashes in up to 16 channels, plus Canon claims it's got a 20 percent faster recycle time.
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If you just want the wireless transmitter with no flash attached, Canon has extracted the 600EX-RT's guts and created a transmitter-only product, the ST-E3 RT.
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Unlike the slim GPS module that the company announced with the 1D X, the 5DM3 is joined by a big hot-shoe model. It does have GPS logging capability, though, which allows you to track your movements between EXIF data location snapshots.
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