We've just added the Sony A7S to our studio test scene comparison. The A7S is a 12 megapixel full-frame mirrorless camera capable of shooting at ISO 409,600. It's as much designed for video as it is for stills, but for now take a look at its low light performance in our test scene and compare it to an ever-growing list of cameras. And if you really want to cut to the chase, skip ahead and see how it does at ISO 409,600.