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03. How to back-focus a camera

Camera back focus adjustment ensures that a camera's image remains in focus during changing lighting conditions. This is a common problem in CCTV installations where one sees a sharp image during daylight but a blur at night. During bright sunlight, the lens iris is closed and the depth of field very wide. When the light level drops, the Iris opens and the depth of field decreases. To reach the optimum focus, the camera needs to be back focused with the lens’s iris fully opened. Proper back-focus adjustment also holds true for zoom lenses which need to be properly adjusted to hold focus through the zoom range.