The iPhone 4 camera is equipped with various settings and options to help you capture optimal photos on the go. Adjust the camera settings on your iPhone to activate the rear-facing or front-facing camera. Change flash settings when lighting conditions call for it or choose to capture High Dynamic Range (HDR) photos. High Dynamic Range blends three different exposures into a single picture for better image quality. You can even adjust the iPhone's zoom just as you would on a regular digital camera.
Tap the "Camera" icon on your Home page. The camera application will load on your screen displaying whatever subject is facing the rear camera.
Tap the lightning bolt at the top-left of the display to view flash options. Select "On," "Off" or "Auto" to apply a flash setting to the camera.
Tap the "HDR" button at the top-center of the display to turn on the HDR feature. Tap the button again to turn off HDR.
Tap the center of the screen to bring up the onscreen zoom control slider. Drag the slider to the right to zoom in. Drag the slider left to zoom out.
Tap the small camera icon at the top-right of the display to switch to the front-facing camera.