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Canon 70D Review

by William Brawley, Mike Tomkins, Dave Etchells and
Preview posted 07/02/2013
Review posted

Canon 70D review -- Front quarter view

The Canon 70D may very well have started a revolution with an innovative autofocus system that's new not only for Canon DSLRs, but also for the camera industry as a whole. Thanks to its Dual Pixel CMOS AF system, the Canon 70D -- a replacement for the three-year-old 60D -- could change the way you shoot both video and still images.

At the heart of this innovation is the Canon 70D's image sensor, a 20.2-megapixel APS-C-type CMOS chip that's been designed to accommodate on-chip phase detection -- but with one huge difference. To date, on-chip phase detect systems have provided but a handful of focus points scattered across the sensor's surface. With the Canon 70D, almost two-thirds of its surface area at the center of the frame can provide phase-detect AF, and not just at a handful of locations -- we're talking phase detect at every single pixel.

And unlike typical hybrid systems which use phase detect simply for a ballpark distance and direction to focus, then fine-tune with contrast-detect AF, the Canon 70D's on-chip phase detect is accurate enough that tuning with contrast detection isn't necessary. That is huge news for video capture, because it means no more hunting around the point of focus. With the AF bobble gone, full-time video becomes a much more exciting proposition, letting you quickly and smoothly guide your viewers' attention between subjects without distraction.

The new image sensor doesn't just drive the completely new autofocus system; in addition, its resolution has been increased slightly over the Canon 60D's. Sensor size is unchanged, but Canon has increased the active imaging area of the sensor slightly, from 22.3 x 14.9mm to 22.5 x 15.0mm. This means that, although pixel pitch has been reduced, the difference isn't as great as you might otherwise expect. A simultaneous switch to Canon's new DIGIC 5+ image processor further aims to tame image noise.

Canon 70D review -- Another three quarter view

The net result is that, according to Canon, the 70D will produce noise levels that are roughly on par with the lower-res 60D for raw shooting. Meanwhile, the company says that JPEG shooters will see a "huge improvement" in image quality. To back up that claim, the ISO sensitivity range has been expanded to encompass everything from ISO 100 to 12,800 equivalents, with the ability to expand sensitivity as high as ISO 25,600 equivalent. Further in our review we'll see if the camera live up to these promises.

The new image processor also yields a significant increase in burst shooting performance, which is now rated by Canon at a full seven frames per second.

Canon has gifted the EOS 70D with a new body that's just slightly smaller, while retaining the same side-swiveling LCD monitor, and packing in several new features. These include a touch-panel overlay on the LCD monitor, built-in Wi-Fi wireless networking connectivity, a stereo microphone, and the same Live View control seen on other recent Canon SLRs. And supplementing the new on-chip phase detection system, there's also a new dedicated autofocus sensor, identical to that used in the EOS 7D.

[Note that in some markets, a variant of the Canon EOS 70D is offered without the aforementioned Wi-Fi wireless networking connectivity. Technically, the Wi-Fi enabled variant is known as the EOS 70D (W), and the variant without Wi-Fi as the EOS 70D (N).]

Canon 70D review -- Comparison with Panasonic GH3
The Canon EOS 70D's design clearly shows a strong focus on video. Here, it's compared to one of the most video-friendly mirrorless cameras, Panasonic's Lumix DMC-GH3.

As well as all of the hardware changes, Canon has made numerous tweaks to firmware as well. These include the ability to preview creative filter effects before shooting, a new 3x to 10x variable video zoom function, the same video snapshot feature seen in recent Rebel-series cameras, and a choice of both ALL-I and IPB compression schemes for video, along with optional time code.

Walkaround. Although the Canon 70D looks a lot like its predecessor, it does feature a brand-new body design. Let's take a look at what's stayed the same, and what's been changed.

Canon 70D review -- Front view

Seen from the front, the Canon 70D is a little less wide than is predecessor. Otherwise, though, the basic dimensions are pretty close to those of the 60D. The arrangement of controls and features on the front of the camera is near-identical. The most significant difference is the absence of the small four-hole microphone port that, on the 60D, sat directly above the model number badge.

Canon 70D review -- Top view

Seen from above, the Canon 70D likewise retains an arrangement very much like that of the 60D. As well as the two four-hole ports for the relocated microphone -- now stereo, and straddling the rear of the hot shoe -- there's a new button between the Shutter button and front dial. This new control is used to select between autofocus area modes. The number of positions on the Mode dial has also been slashed by a third, to just 10.

Canon 70D review -- Rear view

It's when you come to the rear of the camera that the changes are more significant. In fact, something of a game of musical chairs has taken place. The Menu and Info buttons have jumped from the top right corner of the LCD monitor, and now sit above its top left corner, instead. With its chair taken, the Delete button has grabbed a spot at the bottom right corner of the display.

That move left the Playback button homeless, and so it has jumped up to take the spot previously occupied by the Info button. The Quick Menu button now sits above it, with its old spot now button-free. The Unlock / Print button of the 60D is replaced by a Lock switch, and the Live View button is substituted for a more modern Live View switch with central Start / Stop button.

The LCD monitor looks identical, but now features a touch-screen overlay. In other respects, the layout is much as it was.

Canon 70D review -- Left view

The left-hand side of the EOS 70D (as seen from the rear) also shows a few changes. The connectivity available on this side is as it was, but the original single flap covering all of the ports has been split in two, with one half moved slightly behind the other. Microphone / wired remote terminals sit in front of and above the HDMI and combined AV Out / Digital (USB) ports. Above these, the speaker grille is now a nine-hole instead of seven-hole arrangement.

Canon 70D review -- Right view

On the right-hand side, the changes are solely cosmetic, with no features added or removed.

 

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In the Box

The Canon 70D retail box ships with the following items:

 

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Canon 70D Dual Pixel CMOS AF

Breakthrough!

by Dave Etchells |

As the years go by, we see camera technology advance by fits and starts. Some developments are a bigger deal than others, but it's rare that anything really amounts to a true technological breakthrough. However, the Canon 70D's Dual Pixel CMOS AF system qualifies.

This new AF system is as revolutionary a development as any we can remember seeing since the dawn of the DSLR era itself. By integrating accurate, fully-capable phase-detect autofocus over a majority of the image sensor's surface, Canon is fundamentally rewriting the book on autofocus.

The Canon 70D delivers phase-detect autofocus across an area that's fully 80% of the height and width of the sensor, that allows any area within that region to become a focus point, that can remain operational during video recording, and that will operate at any aperture. It's a whole new AF ballgame, and one that's going to shake the DSLR video business to its roots.

Click here for a close look at the 70D's new Dual Pixel CMOS AF system!

Canon 70D Dual Pixel CMOS AF

Canon 70D Tech Info

What else is new?

by Mike Tomkins |

Sensor. The story of the Canon EOS 70D begins and ends with its 20.2 megapixel, APS-C CMOS image sensor. It's absolutely unique, with two photodiodes sitting under a single shared microlens at each pixel location. This, as we've described in much more detail further up the page, allows Canon to provide for on-chip phase detection at every pixel location over almost two-thirds of the sensor's surface area.

The new sensor is also slightly higher-res than the 18.0 megapixel chip of the EOS 60D, although the difference is modest and accompanied by a reduction in pixel pitch from 4.3 to 4.1µm. Simultaneously, the sensor's active area has increased slightly to 22.5 x 15.0mm, bringing a minute reduction in the focal length crop from 1.61 to 1.6x.

Processor. The Canon 70D replaces its predecessor's DIGIC 4 image processor with a newer DIGIC 5+ variant, first seen in the EOS-1D X professional digital SLR. The new processor allows improvements both in performance, and in image quality.

Click to read detailed Canon 70D tech info!

Canon 70D Tech Info

Canon 70D Shooter's Report

Game changer

by William Brawley |

When Canon announced the 5D Mark II five years ago, it took the video production world by storm. It was the first full-frame DSLR with high-definition video recording capabilities, and was offered at an extremely affordable price compared to other large-sensor video cameras at the time. It wasn't a slim margin, either: The Canon 5D II was tens of thousands of dollars more affordable, and yet still had a larger sensor than its rivals! However, for the average video shooter or casual consumer, the 5D Mark II and other subsequent HD-DSLRs all lacked a critical feature: full-time continuous autofocus for video.

Now, the Canon 70D isn't the first Canon DSLR with video autofocus by any means, as most of the brand's newer models have some form of continuous Live View AF. However, the Canon 70D feels like the first DSLR that does continuous Live View AF properly. Canon's new Dual Pixel CMOS AF is pretty amazing -- and not just for video. It works great for still photography, too, as I found out during my time putting it through its paces.

I've been a Canon user for a few years now and shoot both still photography and video. I started with a 7D, and a while later added a 5D Mark II to the mix. In terms of still photography, I love my 5D Mark II for landscapes and occasional events or portraits, but my 7D has been my go-to still camera for capturing anything fast and tough to shoot, such as sports and wildlife, thanks to its more advanced autofocus and higher speed continuous shooting.

Read our Canon 70D Shooter's Report for our take on real-world stills and video!

Canon 70D Shooter's Report

Canon 70D Image Quality Comparison

How is it for stills?

by Dave Pardue

So, the Canon 70D is awesome for video. But how about stills? Does the added resolution help or hinder the 70D compared to its predecessor? Do the Dual Pixel CMOS AF system's two photodiodes sharing a single microlens at each pixel location impact still image quality? We compare Canon 70D with the Canon 60D, Canon 7D, Olympus OM-D E-M5, Pentax K-5 II and Nikon D7100 to find out how the 70D competes in still image quality. Have a look and let your eyes be the judge!

NOTE: Images are best quality JPEGs straight out of the camera, at default settings including noise reduction. All cameras in this comparison were shot with our very sharp reference lenses.

See our Canon 70D Image Quality Comparison

Image Quality Comparison

Canon 70D Conclusion

Best video experience from a DSLR yet!

by William Brawley |

The Canon 70D ultimately may not have delivered what everyone wanted or expected -- a significant upgrade in still image quality over its predecessor, the 60D -- but instead it ushered in a new technology so unexpected (and useful) that there's no way we could be disappointed. We love when a camera manufacturer surprises us with a treat like Canon's Dual Pixel CMOS AF technology. After all, a rare, ground-breaking innovation like this doesn't come around too often.

What's even better is that the 70D's full-time phase detection autofocus system for video and Live View shooting -- with PDAF at every pixel in the AF area -- more than lives up to its promise. We were thoroughly impressed by how quickly and accurately the Dual Pixel CMOS AF operated. For movies, this technology finally puts true camcorder-like performance into an HD-DSLR; it's been a long time coming. Racking focus between near and far subjects is especially easy and smooth with the 70D's LCD touchscreen touch-to-focus feature. And when using Live View for still shooting, the advanced autofocusing felt nearly as fast as traditional viewfinder shooting under most scenarios.

Read the Canon 70D Conclusion for our verdict on this ground-breaking DSLR!

Canon 70D Conclusion