Mirrorless against Nikon D4s in focus stress test

camera store tvThe Camera Store TV have a new YouTube video entitled ‘The Great Mirrorless Autofocus Shoot!‘ If each new mirrorless release promises the fastest focus yet, how do mirrorless cameras compete on quick focus and quick shooting with DSLRs? To answer they pitched four of the best mirrorless cameras against not only themselves but against one of the best DSLR cameras ever released, the Nikon D4s, in an autofocus challenge at a dirt rally track.