Sony A5100 Camera
It's not quite a camera built right into a lens, but the Sony A5100 Camera is so small and light that it's not far off. At its heart is a 24.3 MP APS-C Exmor CMOS sensor — the same one found in the company's well-regarded α6000 DSLR — and the same Fast Hybrid AF system, with 179AF points and a focusing time as fast as 0.07 seconds. It also packs the BIONZ X processor for shooting up to 6 fps, the ability to shoot Full HD at quality of up to 50MB/s, a tiltable LCD screen, built-in Wi-Fi and NFC, an ISO range 100 - 25000, and an included 16-50mm lens with support for tons of other great glass.