Double threaded UV filter. Excellent optics quality. Ideal for lens protection. Made in Japan. An UV filter absorbs ultra-violet rays, which gives bluish mist in colour photography. This filter prevents foggy effects in distant landscape and creates clearness effect. UV filters are wise initial investments. They help protect your valuable investment from dust, moisture and scratches, which can lead to costly repairs. If desired they can be left on the lens at all times for protection.