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Canon 70D Video Recording

The EOS 70D is Canon's latest entry in the HD-DSLR market, and the company is aiming to make a big splash with it, thanks to its brand new Dual Pixel CMOS AF focusing system. When Canon introduced the 5D Mark II, it stunned crowds with its video quality and price, but it lacked a big mass-market feature: autofocus during video recording. Several more recent Canon DSLRs such as the T4i, T5i and SL1 feature full-time continuous AF for video recording, but they still rely heavily on slower and sometimes-jerky contrast-detect autofocus to fine-tune focus. With the 70D, Canon has introduced its all-new Dual Pixel CMOS AF, replacing the Hybrid AF systems found in the aforementioned models with one that splits each individual pixel on the imager into its own phase-detect AF sensor, with no need to fine-tune via contrast detection. Phase-detect AF, the same AF technology DSLRs use for shooting with the optical viewfinder, provides much faster and smoother autofocus for DSLR video shooting.

Canon is putting interchangeable lens video/still cameras like the Panasonic GH3 squarely in its sights. The GH2 and GH3 made big leaps in the HD-DSLR/MILC video space with lots of video-centric features like higher bitrates, an articulated LCD screen, as well as full-time AF for video. With the 70D, Canon is blending features of their higher-end DSLRs, such as offering both ALL-I and IPB formats and time code (though not SMTPE) from the 6D and 5D Mark III, with the articulated LCD of the 60D (adding a capacitive touchscreen in the process), all at a very reasonable price point. And this whole package is built upon a game-changing AF system that will not only provide major competition to other MILCs and HD-DSLRs, but some segments of the camcorder market as well.

Other video specs of the 70D are fairly standard fare for Canon DSLRs. Like the 60D, there's Full HD 1,920 x 1,080 resolution video at 30p and 24p (for NTSC, 25p in PAL mode), plus 720p HD video at 60p (50p PAL). There's also a 3.5mm microphone jack for external mics, as well as manual audio level adjustments with a wind filter and attenuator.

Of course there are always trade-offs, and there are few small details that might deter some users from the 70D. For one, there's no headphone jack for monitoring audio, which many professionals and video enthusiasts need. Also, video image quality appears more like the 5D Mark II and 6D in terms of moiré and aliasing. Canon users who demand the highest quality might opt for the 5D Mark III if this is a deal breaker for them, though they will have to forgo full-time autofocus.

All in all, though, the Canon 70D is a powerhouse for video recording, and not only will high-end users be attracted to the vastly improved autofocus, beginners and average consumers will as well. Here's the full rundown of the 70D's video capabilities, along with our usual selection of sample videos.

Canon 70D Video: Focusing

The clear stand-out feature of the 70D is the new Dual Pixel CMOS AF system. Canon's previous full-time continuous video autofocus systems, called Hybrid CMOS AF (T5i, T4i, EOS-M) and Hybrid CMOS AF II (SL1), used both phase-detect and contrast-detect AF. The way this system worked was that phase-detect would get the ball rolling for focusing, then contrast-detect would take over for fine-tuning to achieve crisp focus. The downside is that this process is typically slower, plus the lens still has to hunt back and forth a bit to determine the point of best focus. This can have undesirable effects for video recording, as focus can jump back a forth if the subject moves at all in the frame during recording, and if the subject moves quickly, the camera may struggle to refocus.

Canon 70D Video AF Comparison: 70D versus Panasonic GH3 and Canon SL1
1,920 x 1,080, MOV, Progressive - Download Original (209MB MOV)

With the new Dual Pixel system in the 70D, Canon has designed an autofocus system that uses phase-detect AF all the time, both before and during video recording. What this means is that there's no more hunting when focusing, and AF is quite fast to acquire focus. Furthermore, Canon has designed the AF system for video to be very smooth and more "cinematic," shifting focus smoothly from one subject to the next. The autofocus on the 70D looks very much like a professional camcorder in terms of smoothness and performance.

As with the Canon SL1's Hybrid CMOS AF II system, the new Dual Pixel CMOS AF in the 70D system utilizes an extremely large area of the sensor for autofocusing, as shown in the illustration below. In fact, 64% of the total area of the sensor (80% of the frame, vertically and horizontally) can be used for phase-detect AF.

Canon 70D review -- Autofocus area simulation
In the example image above, the area inside the green line shows the area available for phase-detect autofocus during movie capture and Live View with the 70D.

On the outside, the 70D functions similar to other Canon DSLRs with Movie Servo AF. Users are given three different focus options:

Canon 70D Touch AF Demo
1,920 x 1,080, MPEG-4, Progressive, 30 fps
Download Original (8.7MB MP4)

The Canon 70D features a large, 3-inch capacitive touch screen which, when coupled with the Dual Pixel CMOS AF, allows for very fast and easy control of autofocusing in video. When using Movie Servo AF and the touchscreen and focusing modes like Flexi-Zone Single, shooters can make easy and professional-looking focus changes simply by tapping on the screen to indicate the subject they want in focus. The Touch AF system makes it easy to rack focus from near and far subjects quickly, accurately and smoothly, without any hunting.

Of course, manual focusing is also available on the 70D, as is disabling the continuous Movie Servo AF feature and using a single-shot autofocus prior to recording video to set focus. The 70D does provide the option of magnifying the Live View display by factors of 5x or 10x to get a precise look at manual focusing prior to the start of recording. In common with all other HD-DSLRs we've seen to date, though, the magnified focus-assist view is only available when not actively recording.


Competitive AF tracking test

We had a fair range of AF tracking examples from outdoor shooting, but wanted to try some more controlled indoor tests. We'd seen an example posted by someone on the Internet (sorry, can't recall who, to give them fair attribution), of a little stuffed animal swinging as a pendulum, showing how well the Canon 70D did, particularly with an STM lens. We decided to repeat that test, and use it to compare between three different cameras.

In the videos below, the subject was a small, stuffed dog toy, hanging from a length of monofilament fishing line about 3 feet long. It was positioned about 8 feet from the camera and about 30 inches in front of the background poster. The arc it traveled had a maximum extent of +/- 10 inches relative to the camera position. In all cases, the focal length was roughly equivalent to a 140mm lens on a 35mm full-frame camera. The amount of focus actuation required by the combination of focal length, distance, and subject movement is probably at the edge of what you'd encounter filming a real-world subject: The little swinging toy was moving quite a bit & fairly rapidly, relative to the long focal length and relatively close shooting distance.

The results were interesting. The 70D with the 18-135mm STM kit lens did indeed do pretty well, although we found that it tended to lag slightly, particularly as the subject changed directions. Importantly though, the operation of the focus-actuation motor was virtually inaudible. Trying the same test with a lens having a conventional focus motor (the Canon 24-105mm f/4L), we found that the AF didn't track quite as closely, and the focus motor's noise was very evident on the audio track.

In our outdoor AF tests with the Canon SL1 and its Hybrid-II AF system, the SL1 did quite well tracking larger moving objects, in many cases performing nearly as well as the 70D. It didn't do nearly as well in this lab test, though, as it rarely seemed to adjust focus at all, in response to the varying distance of the subject. It performed by far the poorest of the three cameras in this little comparison test. We used the 18-135mm STM lens for this test.

The third camera we tested with this setup was the Panasonic GH3, and we were rather surprised by how well it did, using Panasonic's 14-140mm f/3.5-5.6 lens. It didn't track perfectly, but then none of the cameras did with this setup, and the GH3 seemed to perform at least as well, if not slightly better than, the 70D. We were surprised, as the GH3 uses strictly contrast-detect AF, so the camera has no absolute distance information to work with. Nonetheless, perhaps thanks to its very fast 240 Hz AF cycle and intelligent tracking algorithms, it managed to track the rapidly moving subject surprisingly well.

Canon 70D: AF Tracking Comparison Tests
Canon 70D + EF-S 18-135mm f/3.5-5.6 IS STM
1,920 x 1,080, MOV, Progressive, 30 frames per second
Download Original
Canon 70D + EF 24-105mm f/4L IS USM
1,920 x 1,080, MOV, Progressive, 30 frames per second
Download Original
Canon SL1 + EF-S 18-135mm f/3.5-5.6 IS STM
1,920 x 1,080, MOV, Progressive, 30 frames per second
Download Original
Panasonic GH3 + Panasonic 14-140mm f/3.5-5.6 ASPH
1,920 x 1,080, MOV, Progressive, 30 frames per second
Download Original

 

Canon 70D Basic Video Specs


Canon 70D Video: Image Size, Frame Rate, and Encoding

The Canon EOS 70D offers three different video resolutions and five frame rates, although only two or three rates are available at any given resolution.

Canon 70D Video Options
MPEG-4 AVC Format (H.264, .MOV files)
Resolution
Aspect Ratio
Frame Rate
File Size

1,920 x 1,080

16:9

30p (29.97 fps)

ALL-I: 685 MB/min
IPB: 235 MB/min

25p (PAL)

24p (23.976 fps)

1,280 x 720

16:9

60p (59.94 fps)

ALL-I: 610 MB/min
IPB: 205 MB/min

50p (PAL)

640 x 480

4:3

30p (29.97 fps)
IPB: 78 MB/min

25p (PAL)


The Canon 70D, like all of Canon's video-capable DSLRs, only shoot in progressive scan formats. Although television broadcast video works well with interlaced formats, progressive video is more suited for computer playback and avoids deinterlacing issues.

Canon 6D movie resolution options

Canon's DIGIC 5+ image processor gives the 70D capability for both 1080p and 720p video recording. The 70D, along with all Canon video-capable DSLRs (with the exception of the $12,000 EOS 1D-C cinema DSLR and its siblings) still do not provide the option of full 1080p video at 60 frames per second, which could be a drawback for more professional shooters who need that combination.

The 70D limits the minimum shutter speed depending on the frame rate. For 30p/25p/24p, users are limited to 1/30th of a second. For 60p and 50p video, you are limited to 1/60th of a second.

The inclusion of 720p HD video at 50/60 frames per second is a great feature, as it allows users to more easily film fast action scenes. The faster frame rate also helps should you want to produce some slow-motion video in post-production. It might not be the best format to use in low-light scenarios, however, due to the slowest allowable shutter speed being 1/60th of a second at those frame rates.

The Canon 70D records all video using MPEG-4 AVC/H.264 encoding, at variable bit rates in the .MOV format. Like the 6D, the 70D gives features two compression schemes in the HD resolutions, ALL-I or IPB. The difference lies in how each frame of the video is compressed. Not surprisingly, there is no uncompressed "RAW" video capability in the 70D. ALL-I format, nevertheless, yields a higher image quality by compressing each frame individually, at the expense of file size, whereas IPB is an "interframe" scheme and compresses multiple frames at a time. This results in a slightly lower quality picture, but the files produced are roughly a third the size of those for ALL-I.

Most computers and editing programs made within the last few years should be able to play 70D files with little problem, but high-def files may strain older systems, especially during editing of IPB video. For users shooting video destined for video editing software, ALL-I format video is the format to pick if your memory card can handle the space and increased bit rate. File sizes for the 70D's ALL-I clips can be massive, as you can see in the MB/minute rates listed in the table above. If you can handle the storage requirements and require higher image quality, choose ALL-I. Canon recommends using at least 20MB/second or faster Secure Digital memory cards for ALL-I, and 6MB/second or faster for IPB. Even faster cards will be needed if you plan on shooting stills during video capture, which will cause a brief interruption to the video feed. If your card is not fast enough, a five-step buffer fill warning will appear on the LCD screen.

Canon 70D Video: Image Quality

The 70D produces very high image quality in video, with great, crisp detail and accurate color rendition. Scenes shot in bright daylight look a bit too contrasty to our eyes, though, with shadow areas being pretty dark with the Standard Picture Profile. Users looking to get the most dynamic range out of their clips should use a custom picture style with decreased contrast. In low-light scenes, the 70D did a great job, with nice detail overall and decent shadow detail. While there was visible high ISO noise in our nighttime test videos, it wasn't severe enough to significantly degrade the image quality.

Although we saw much-improved handling of moiré and aliasing effects in the 5D Mark III compared to its predecessor, that doesn't seem to be the case with the 70D. In our test videos, a fair number of moiré pattern artifacts could be seen in the standard problem areas like window screens, roof shingles, and fine patterned fabrics. Moiré and aliasing are even more pronounced in 720p video, which has been the case with other Canon DSLRs we've seen in the past. Overall, moiré artifacts look very similar to those seen on the 6D and 5D Mark II. This isn't a deal breaker by any means, and while it could be a deciding factor for professionals or high-end video shooters, most users should just be careful where they shoot and be on the lookout for problems with the patterns in people's clothing, etc.

Below you can see our standard array of sample videos for the 70D:

Canon 70D: Video Samples
1,920 x 1,080
MOV, Progressive, 30 frames per second, ALL-I Mode
Download Original
1,920 x 1,080
MOV, Progressive, 30 frames per second, IPB mode
Download Original
1,920 x 1,080
MOV, Progressive, 24 frames per second, IPB mode
Download Original
1,280 x 720
MOV, Progressive, 60 frames per second, IPB mode
Download Original
1,920 x 1,080
MOV, Progressive, 30 frames per second, ISO Auto, ALL-I mode - NIGHT
Download Original
1,920 x 1,080
MOV, Progressive, 30 frames per second, ISO Auto, IPB mode - NIGHT
Download Original
1,920 x 1,080
MOV, Progressive, 24 frames per second, ISO Auto, IPB mode - NIGHT
Download Original
1,280 x 720
MOV, Progressive, 60 frames per second, ISO auto, IPB mode - NIGHT
Download Original

Canon 70D Video: Exposure Control

Canon 70D Movie Mode

Like most previous Canon DSLRs with video recording, the 70D allows for full manual exposure settings and adjustments including full control of shutter speed, aperture and ISO before and during recording. In all modes, except for M, the 70D switches to automatic exposure adjustments while in live view movie mode. As such, the 70D is very user friendly for both kinds of shooters: those that want a simpler video shooting experience and more advanced users who want more control over how their videos look. (It still would be nice, though, to have options like aperture priority available.)


Canon 70D Video: Audio Recording

ports

The Canon 70D has similar audio recording features to the 5D Mark III. Like many previous Canon video DSLRs, the 70D gives users the choice of recording audio with an internal stereo microphone or a third-party external stereo microphone via a 3.5mm mic jack. Audio levels are fully adjustable, with wind-cut filter and attenuator options.

The big downside to the 70D's audio capabilities is that, unlike the 5D Mark III, the 70D does not feature a headphone jack for monitoring audio. This was a much-lauded feature when it was finally introduced into the Canon DSLR lineup with the 5D Mark III. Many advanced video shooters will surely be a little disappointed to find this feature missing.


Canon 70D Video: Rolling Shutter Artifacts ("Jello effect")

Like all video-capable DSLRs and interchangeable lens cameras on the market today, the Canon 70D has to contend with rolling shutter artifacts. These image distortions are caused by the way the image is read from the camera's sensor. Data is read line-by-line, rather than the entire frame at once, so the top of the image is recorded at a slightly different time than the bottom. Therefore, when panning or moving the camera side-to-side quickly, vertical lines in the image can appear to bend and slant back and forth in a "Jello-like" effect.

The 70D did pretty well controlling the amount of rolling shutter distortion. At the 1080p resolution, rolling shutter distortion was noticeable but minimal, and even less so at 720p. Overall, the 70D places well within the upper range of DSLRs when it comes to rolling shutter. As long as you are mindful of this effect, and avoid quick pans or back-and-forth motions, particularly around objects with vertical lines like trees and buildings, you probably won't notice the rolling shutter distortion.


Canon 70D: Rolling Shutter Artifacts
1,920 x 1,080
MOV, Progressive, 30 frames per second, ALL-I mode
Download Original
1,920 x 1,080
MOV, Progressive, 30 frames per second, IPB mode
Download Original
1,920 x 1,080
MOV, Progressive, 24 frames per second, IPB mode
Download Original
1,280 x 720
MOV, Progressive, 60 frames per second, IPB mode
Download Original