I asked 1 whether the wedding photographer works in a photo studio and buys his own camera.

You don't need to bring your own camera. The camera itself is a consumable, and many photographers don't take it out when they have their own cameras. Because the consumption of cameras in the studio is amazing. For example, a photo studio bought a new camera. Two years later, even before it was out of date, it was on the verge of scrapping. Let's calculate, a photographer takes 4 pairs of customers every day, and each pair of customers takes 125 photos on average, which means about 500 shutters a day. 1 month is 1.5W shutter times. It will be 32W shutter times in two years. At present, the design shutter life of many cameras is about 10W times. As a photographer, you certainly don't want to change your beloved camera to 1 in two years, do you?