Understanding light is the most valuable skill you can learn as a photographer. Lens flare can be accidental or deliberate. Some photographers like the look of lens flare because it can add a touch of realism and heighten artistic drama; others don’t like it. It depends on your photography style and what look you hope to achieve with your images. In any case, it’s helpful to know what causes lens flare so you can learn how to prevent it—or, in some instances, learn how to deliberately achieve it. Photo ©: Jay Cassario