Sonys first mirrorless, full-frame cameras were designed to impress photographers. Now the Japanese company is going after videographers with a new variant of its 35mm, interchangeable lens camera, dubbed the A7s. For those who shoot video, the standout feature is that the A7s (unlike the A7 and A7r before it) can shoot full 4K video. Thats the top end of its expanded sensitivity range, so its safe to assume that results at that level will be a bit ratty, but its an incredible number that matches Nikons pro-level D4S.