Have you ever wondered: Why does the camera make very specific 'Click' sounds when taking photos? Which component made this sound?
All professional cameras (DSLR or Mirrorless) have a part named 'shutter', located right in front of the image sensor. Most of the current shutter is a 'focal plane' shutter, which is very close to the focus point of the lens placed in front of it.
If your camera is a DSLR (with flip mirror), then we have one more noise agent that is the mirror that is placed in the front. Every time you take a picture, the mirror will 'flip' up to let the light go into the sensor. This mechanism makes SLR and DSLR cameras work noisier than other cameras.
Some high-end Medium Format lenses or cameras use a 'leaf' shutter, which is attached to the lens instead of the camera body. This type of shutter is slower, but will be quieter and allow users to use the flash at fast shutter speeds (good flash synchronization).
Sensor in the camera
In the latest models, vendors use fully electronic or electronic shutters. Using the opening or closing of the power on the image sensor, one can completely or completely eliminate the use of mechanical shutter to block light. This mechanism is quiet, or even makes no noise because of reducing or not using any physical component.
Electronic shutter has two advantages: quietness (mentioned above) and speed of operation. The Sony RX10 has a 'leaf' shutter, which can shoot at a speed of 1/2000 seconds, but when switching to electronic shutter mode, it can shoot at speeds up to 1 / 32,000 seconds! This is also the weakness of mechanical shutter types, because they will only have a maximum speed from 1/4000 to 1/8000 seconds, limiting users to choosing different light values.
All cameras on smartphones today use full electronic shutter, not moving components. This is why manufacturers have to add fake noise, so that users know the photo has been taken.
These sounds are collected from regular shutter cameras! In some countries such as Japan or Korea, smartphones must have a shutter sound to avoid crooks who violate the privacy of others.
According to photographer Dave Haynie