Some cameras may calculate the amount of light from the center of the image in the viewfinder. Other cameras may calculate the amount of light based on an average of the full image in the viewfinder. Some cameras provide a choice. A few higher-priced SLR cameras provide an optional selection of viewfinder screens for different exposure and focus selections. SLR camera models may offer even greater versatility with automatic, semi-automatic and manual exposure controls.
Most cameras have fully automatic exposure.
Some cameras also have a Macro Focus mode. It is designed to provide additional light, when needed. Many cameras include several selectable flash modes for different situations. Among these modes, the most popular is Red-Eye Reduction. The built-in flash is usually very small so its range of operable distance is somewhat limited.