Why does the surrounding area of ??the photo turn black when I turn on the flash when taking a photo? How to solve it?

The principle of this phenomenon is as follows:

Digital cameras have the ability to automatically detect environmental illumination in automatic mode. When the illumination is found to be low, the camera will automatically adjust Three major exposure parameters (shutter, aperture, ISO sensitivity) are included to adjust the brightness of the photos as much as possible. Without a flash, the light and shadow of the shot are basically the same as they look to the naked eye. But when the flash is turned on, the camera automatically thinks that the ambient illumination should be two or three steps brighter than before, so it adjusts the three parameters to lower the exposure by two or three steps. When the flash is set, the final picture is that the areas illuminated by the flash are bright enough, and the areas not illuminated are pitch black.

This is also a common problem with body flashes. After all, the intensity of machine flash can only guarantee the illumination intensity within a range of 3 meters, and it cannot take care of scenery further away.

So photographers rarely use on-camera flashes. Even if they use external flashes, they are wirelessly triggered from a long distance. They are placed in different positions according to creative needs and are rarely placed in front of the camera. irradiated.

When encountering an environment with insufficient illumination, the suggestions given here are:

1. Manual transmission players.

The principle is to lower the shutter speed, maximize the aperture, increase the ISO, and if necessary, sacrifice some image quality to above 1000.

When the illumination is so low that neither 1000ISO nor the safety shutter can be maintained, bring an external flash (for portraits) or a tripod (for landscapes). When taking pictures of people, lower the shutter below the safety line and turn on the flash front curtain or Rear-curtain synchronization, adjust the position and distance of the flash appropriately until the exposure of the person and the environment reach the desired balance. When shooting only landscapes, set up a tripod, turn down the aperture and ISO, and lower the shutter until the exposure is sufficient.

2. Automatic players.

Adjust to night scene or night scene portrait mode (available in most digital cameras). At this time, the camera will automatically reduce the shutter speed and open the aperture and flash. Pay attention to hand shake. Since the automatic mode has low controllability, it is difficult to achieve the desired effect. It is recommended to bring a tripod to increase the success rate.