Define fixed focus

The fixed focus technology uses a very small lens with a tiny aperture, thus making all visible subjects in focus no matter their distance from the camera. This lens cannot adjust its focal point, the distance where images appear sharp and in focus. Fixed focus lenses rely on their typically large depth-of-field in order to ensure that most commonly photographed subjects are reasonably in focus. A fixed focus lens will sometimes be designed to have a bias towards either portrait or landscape/scenery photographs. This is different from autofocus which actually changes the focus of the lens, based on the distance of the subject from the camera.