The difference between Sony a9 and a7

A9 is indeed better than A7 series in terms of parameters and performance. Sony also made it clear at the press conference that this professional micro-camera will pay more attention to professional sports photography. A9 is a camera for sports photography and ecological photography. Faced with these two aspects, there are naturally higher requirements for the material of the fuselage and the strength of the lens interface. Both the material of the fuselage and the material of the bayonet are made of stronger materials. Compared with A7 series, a9 battery doubles directly. The memory card slot design of A9 is actually a combination of many factors. Because A7 got good feedback in the market because of its small size design, A9 chose a smaller SD card. As for speed, one of A9' s dual card slots supports UHS-II card, which is Sony's new generation SD card product, and the speed is quite fast enough to meet the needs of most photographers. A big improvement of A9 over A7 is that the sensor is upgraded to a newly developed stacked sensor, which is faster and can support 20 high-speed continuous shooting per second.