• 220° viewing angle and perimeter fisheye depiction: Envelop video representation of all directions. Capture unique photos as if the world condensed into a sphere • F2.8 Brightness and High Optical Performance: Delivers clear images even at night and starry scenes. 10 optical design in 8 groups including 4 high-index lenses and 2 ED lenses for clear and high contrast from center to peripheral • EXCELLENT OPERATION: Focus ring with moderate torque and aperture ring at key values for a more comfortable operation • EXQUISITE DESIGN • Portability and Durability: It supports a full size and weighs approximately 12.6 oz (340 g) of portability and a robust metal barrel design, so you can safely carry it while traveling or outdoor photography