Sony just announced its latest flagship point-and-shoot at an event in New York City, the RX10 IV. The new camera, a successor to last year's RX10 III, again comes with a 24-600mm (35mm equivalent) f/2.4-4 Zeiss Vario-Sonnar T* lens and a 1-inch, 20.1-megapixel stacked CMOS sensor. In terms of design, the RX10 IV is basically identical to its predecessor, featuring mode and exposure dials, a 3-inch LCD screen and an OLED viewfinder. Here's where it really shines, though: Sony says this zoom shooter sports the "world's fastest" autofocus speed of 0.03 seconds, complemented by 24fps continuous shooting (with full AF/AE tracking) and 4K (3,840 x 2,160) movie recording at 24 or 30fps.