This dynamically wide lens of the Ttartisan Fish Fish Fish Fish Fish is a lens that covers the APS-C matrix, but in the case of use with a full-frame matrix, it also works like a round fish eye. In the case of use in a full -frame apparatus with an image converter, the round image of the fish eye is heavily vignetted in all four corners. The design of the lens provides an 180 viewing angle to get a clear visual effect characterized by dramatic distortions and a creative presentation of space, which helps in creating wide and innovative photos of landscapes and interiors. The characteristic distortion of fish and close focus distance of 12.5 cm focus are also suitable for surreal and exaggerated portraits and photos up close. Specification: Fastening: aperture range: F2 - F11 Angle of view: 180 degrees Minimum sharpening distance: 12.5 cm Number of aperture: 7 Weight: 370 g