What is the use of surround in SLR? What is dynamic D light?

Surrounding is taking three photos in a row, underexposed, normal and overexposed.

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.

SLR cameras (SLR cameras) are also called SLR cameras. Refers to a camera that uses a single lens, through which light shines on the reflector and takes a view through reflection.

The so-called "single lens" means that the photographic exposure light path and the framing light path * * * use one lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens.

"Reflection" means that a plane mirror in a camera separates two light paths:

When watching, the reflector falls, reflecting the light of the lens to the pentaprism and then to the viewing window; When shooting, lift the reflector quickly, and the light can shine on the film or photosensitive element CMOS or CCD.