A few days ago, we learned about the iPhone’s shutter, the part of the camera that “opens and closes” to let light onto the sensor. Today, we’re taking an in-depth look at the aperture, aka hole. The aperture is an opening in the lens that can be made bigger or smaller. Like shutter speed, its primary purpose is to control how much light reacts with camera the sensor (or film).
Also like shutter speed, aperture has some extra effects on how the image looks. Specifically, it can control how much of the image, front to back, looks sharp.