Sony a7s Review: A Video Camera Pretending to Be a Mirror-less DSLR

The a7s is an interesting addition to Sony's new line of full-frame cameras.  It follows the standard a7 entry-level full frame camera and the a7r.  Just as the 'r" in a7r stands for resolution—as in high resolution—the "s" in a7s stands for sensitivity.  In fact, the a7s puts such a focus on low light sensitivity that it results in some serious trade-offs in resolution.