Ultraviolet (UV) filters are clear, glass or plastic attachments for camera lenses. Their primary purpose is to block ultraviolet light from reaching the sensor. A common misconception is that they significantly improve image quality in normal shooting conditions. While they offer some protection against scratches and dust on the lens element, their effect on visible light is generally negligible with modern lenses and sensors.
The cost of a UV filter can vary dramatically, from a few dollars to over a hundred. This range reflects differences in construction quality, coatings applied to minimize reflections, and the materials used (e.g., standard glass versus more durable and expensive options). While inexpensive filters might suffice for basic protection, higher-quality filters can provide better optical clarity and durability, reducing the risk of flare and ghosting, especially in challenging lighting conditions. The historical context of UV filters dates back to film photography, where they were more vital due to film’s sensitivity to UV light. Today, their role has largely shifted to lens protection.
