Keeps Your Subject In Focus：This filter creates a blurry refraction FX while leaving middle open for focus on subject.With this glass prism, you can shoot some interesting effects. Blurry Refraction Effects：Get unique effects depending on your focal length.Creates Blurry Refraction FX while leaving middle open for focus on subject. A surprise prism ：It can be used as a photography accessory to create cool refraction in photos.In the scenes of people, scenery, night scenes, etc. Anamorphic Blur Edge Vortex Effect：This filter creates Blur Edge Vortex Effect on your images to give them a unique look.You can play more unexpected tricks. Material：Made of high quality solid K10 Optical Glass material, provide the great value of clarity and transparency. Jorixxy 77mm Whirlpool Prism Camera Glass Filter Photography Lens SLR Camera Accessories