With the introduction of the EOS 70D ($1199+), Canon is aiming to make its mid-range DSLR a go-to tool for shooting not only photo, but videos. Although the body is very similar to that of the EOS 60D, there are some serious changes on the inside. While still APS-C-sized, the sensor packs Canon’s new Dual Pixel CMOS AF auto-focus technology, designed to make the camera’s video focusing faster—camcorder-quality—while radically…