The camera is set in a proper direction by the viewfinder.
Viewfinder and its types
Viewfinder helps you stabilize the camera better. Viewfinders also have an associated magnification number.
The two main types of viewfinders are
- A pentaprism, found on professional-grade DSLRs, uses a prism to redirect the light from the lens to the viewfinder.
- Pentamirrors are generally found on entry-level DSLRs and are constructed of plastic (instead of glass)