What is the flash of a general SLR camera for?

Flash: when the light is insufficient, use flash to fill the light. When the color is off, you can use the flash to correct the color. When the contrast is high, you can use a flash to reduce the contrast. You don't need a flash to shoot the night scene, but you must use a tripod. In addition, the night view of the landscape is like this, but if you need the characters in the night view as a souvenir, you definitely need a flash. (In order to ensure the night scene effect, slow shutter+flash test flash, monitoring pre-flash, multi-point AF auxiliary lighting and simulated lighting are needed; Compatible with various flash operations available for cameras: i-TTL mode, advanced wireless lighting, FV locking, flash color information exchange, automatic FP high-speed synchronization and AF auxiliary lighting multi-flash device for multi-point AF. Photo operation: advanced wireless lighting SU-4 wireless multi-point flash device photo switch: Turn the power switch/wireless mode switch of the multi-point flash device, turn on or off the XX-XXX flash, and set the standby function.

The full name of the lamp is ring flash. As the name implies, the ring flash is a professional flash installed in front of the lens, which is arranged in a ring or ring. Generally used when taking macros. Generally, SLR cameras can be equipped with ring flash, and the macro effect has nothing to do with the camera model. Some photographers also use high-power ring flash in portrait shooting, in order to eliminate the obvious outline shadow left on the back of the portrait after ordinary single-point flash, and the ring flash can also leave a round eye. Due to various restrictions, the function of the built-in flash is not perfect. Some of them can realize Hou Lian synchronous flash, surround flash exposure and flash exposure compensation. The flash index is 14~20, which is far from the index of "independent external flash" (60).