Nikon has officially unveiled its new flagship mirrorless camera, the $5,500, 45.7-megapixel Z9 with 8K 30p video and up to 20 fps RAW burst shooting speeds. It's Nikon's first camera to use a stacked sensor with built in memory that allows for very fast readout speeds. In fact, Nikon is so confident in the electronic shutter that it has abandoned the mechanical shutter entirely, so the Z9 is the first high-end professional camera without one. With that high-speed sensor (which has the same megapixel count as the Z7 II), the Z9 allows a flash sync of up to 1/200th of a second, which looks like the fastest sync speed ever for an electronic shutter. That should also make it very resistant to rolling shutter, which is crucial if the camera is to be used for sports or action photography. The faster sensor allows JPEG burst shooting at up to 30 fps, or RAW photos at 20 fps.