The EOS 70D is the launch platform for Canon's Dual Pixel CMOS Autofocus, which provides great improvement in focusing speed while in Live View, both for stills and video.[5] At large apertures such as f/1.8, the 70D's Dual Pixel CMOS Autofocus provides a significant improvement in focus accuracy and consistency over conventional autofocus.[6]
Digital Zoom in movie mode—offers a full HD crop from the center of the sensor for an approximate 3x zoom with no loss of image quality, plus a digitally interpolated 10x zoom (only previously available on 600D/Rebel T3i)[10]
AF microadjustment (was introduced on the 50D, but not present on the 60D)
The 70D allows microadjustment at both focal length extremes of the same zoom lens.
Exposure bracketing of up to 7 frames (3 frames for the 60D)
One SD/SDHC/SDXC card slot, supports the UHS-I bus (UHS-I support is an upgrade compared to the 60D)
External 3.5mm stereo microphone jack
Viewfinder level indicator. The indicator remains active in autofocus mode until the shutter is released. (In earlier Canon bodies with this feature, the indicator remains fully active only in manual focus mode; if in autofocus mode, the indicator disappears from view once the shutter button is half-pressed for autofocus.)[11]
Phenomenon
The Canon EOS 70D with certain serial numbers (within the range "00" to "22") produced the error codes 70 and 80 due to circuit board issues associated with high internal temperatures during prolonged use, notably when filming video for long periods of time.[12] Continued use with error codes would often result in a completely dead camera due to heat-related circuit board component failure. Canon had recalled the product. Customers who experienced this phenomenon could contact Canon by registering their serial number and requesting free service/replacement, which included replacing the circuit board if needed.[13][14]
This recall program was discontinued at the end of 2022. [15]
^"Dual Pixel AF vs. Conventional AF accuracy". Digital Photography Review. Retrieved 12 October 2013. We've also found that it offers clearly greater accuracy and consistency than the conventional AF system