The Sigma 8mm f/3.5 EX DG Circular Fisheye is a specialized prime lens designed for full-frame DSLR cameras with a Canon EF mount. It captures a dramatic 180° angle of view, creating the characteristic circular image that allows you to fit an immense amount of a scene into a single frame. Inside the compact housing, 11 elements arranged in 6 groups work together to manage the extreme perspective, while the f/3.5 maximum aperture provides a versatile starting point for various lighting conditions. You can adjust the depth of field down to f/22, and the lens allows for close-up work with a minimum focusing distance of 13.5 cm. Weighing 400 g and measuring 68.6 mm in length, this lens is easy to carry during long shoots. It comes with a dedicated lens hood to manage light and a protective case for safe storage, making it a practical choice for photographers looking to experiment with ultra-wide, distorted perspectives in architecture or nature.