Traditional Culture Encyclopedia - Photography and portraiture - Why can the flash of a SLR camera only be adjusted to 200?

Why can the flash of a SLR camera only be adjusted to 200?

If high-speed synchronization is not supported, the shutter mode is generally around 200, because the flash needs to be synchronized with the shutter curtain to fill the light correctly. The high-speed synchronous shutter speed can be selected in the flash setting, so that the exposure intensity of the flash fill light body is not limited. Because the flash speed is very fast, much faster than the shutter speed, adjusting the shutter will not affect the exposure intensity. Generally speaking, when the flash fill light is constant, the aperture is used to adjust the foreground exposure of the flash fill light. The shutter adjusts the background exposure outside the flash range.