Material and construction: glass with an aluminum frame delivers durability and long lasting performance. Core function: Center Lens Filter keeps the subject sharp while creating a soft blur at the edges, adding an artistic touch to your photos. Benefits for portraits: Ideal for portrait photographers and those seeking creative effects; helps produce stunning portraits with subjects and dreamy backgrounds, enhancing depth and beauty. Performance and reliability: Designed to deliver clear subject rendering with smooth edge blur and consistent results, ensuring professional results over time. Use scenarios: Studio headshots: maintain a crisp, well defined subject while the background softens for a clean, professional look. Outdoor portraits: add depth and atmosphere to scenes without overpowering the subject. Creative fashion shoots: emphasize the subject with a sharp center while introducing an artistic edge blur for unique visuals. Size and compatibility: Available in standard sizes to fit common lens filter threads; choose the size that matches your lens to ensure proper fit.