How does a DSLR camera allow the photographer to compose shots?

A DSLR camera allows the photographer to compose shots through a mirror system that reflects the actual scene in real time, which enhances the accuracy and immediacy of framing a photograph. This mirror mechanism is part of the reflex design of the camera, directing light from the lens up to an optical viewfinder. When looking through the viewfinder, the photographer sees exactly what the lens sees, making it easier to compose shots with precision.

This method of composition is particularly beneficial in various lighting conditions and provides a clear image without lag or pixelation, which can sometimes occur with electronic displays. In contrast, while other options involve the use of screens or electronics, they do not offer the same level of immediacy and optical clarity that comes from viewing through the lens using the mirror system in a DSLR.