Create Striking Focus Effects – This unique diopter filter adds blur to both sides while keeping the center sharp, drawing attention to your subject without the need for post-editing. Adjustable Blur – Rotate 360° to control the level of blur and achieve personalized effects. Crystal Clear Quality – Made from premium K9 optical glass for high transparency and image clarity. Easy to Use – Attaches to 77mm lenses or others with an adapter. For best results, use an aperture between f/2.8 and f/7.