Nikon has very quiet focusing sound for z-bayonet lens without reverse launch. When using the lens of Nikon SLF bayonet AF-S motor through FTZ adapter ring, there will be certain noise, and recording with built-in microphone will be affected. The AF algorithm developed by Nikon will keep the AF performance while reducing the motor working speed slightly to reduce the noise to a certain extent. With the advent of the video age, the video capabilities of micro single products are also very strong, so the significance of Nikon’s move is very clear. It is true that the traditional AF-S motor will have noise problems in focusing, and the interference to video radio is obvious. This is also an urgent problem to be solved. However, the effect of hardware problem solving by firmware still needs to be proved by actual combat.