Hoya HMC Multicoated UV(0) filter 52mm in plastic holder

UV filters, as the name implies, block ultraviolet light. Most digital cameras get little of this anyway, unless you work at a great height where the UV radiation is a lot stronger. Then the UV can create a blue haze over your photo and the use of a UV filter is recommended. Yet UV filters can be found in many standard photography equipment. Clear UV filters are mainly used to protect the lens as they do not add any visual effect to a photo. The tempered glass provides an extra protective layer between the outside world and your expensive lens, so that it can absorb any scratch or impact damage. A UV filter is then a much cheaper solution than having the glassware of your lens repaired.