What's the use of encirclement in SLR?

Surrounding is taking three photos in a row, underexposed, normal and overexposed. You can set the range of underexposure and overexposure by yourself (the default is 1EV, that is, the first exposure compensation). In the past, the cost (the cost of film and developing photos) was increased in this way to ensure the success rate of shooting. In the digital age, this function is of little use, especially for amateur photographers.

As for combining three photos into one to improve the dynamic range of later photos, this is called HDR technology. Please check whether there is an HDR chapter in the manual. Nikon's new cameras should all have this function.

Speaking of this HDR, it will be more meaningful (save trouble) if the camera completes automatically. If users are allowed to manually process the photos in the later stage, it is better to use the photos in RAW format, which is the same as the post-adjustment, and the effect is better.

In addition, during the continuous shooting process of HDR, both the camera and the scene need to remain still, otherwise, ghosting will occur. In short, there are quite a few restrictions.

D-Lighting is a unique function of Nikon, which also improves the dynamic range. However, it is not as effective as HDR and RAW post-adjustment through internal algorithms. In order to avoid image quality problems or strange pictures, it is recommended to drive it normally, not too high.

Note: the dynamic range is the series of the camera from extremely bright to extremely dark. The larger the dynamic range, the more details remain in the highlights or shadows of the photos. If you often take pictures of scenery, you will find that sometimes people turn the blue sky into pure white and the shade into darkness, because the dynamic range of the camera is far less than that of the human eye.