Ultra wide -angle lens.It has a strong sense of perspective and a spectacular angle of view, which is different from the naked eye.A high -performance short -angle lens that can obtain an ultra -wide -angle equivalent of 14mm (21.5 mm in 35mm format), a strong perspective and a glance that is different from the naked eye, which has a strong perspective and a glance of Ultra Wide.You can enjoy a clear, clear depiction, vivid color tone, and less distortion expressions.- Lens mount PENTAX Kaf Mount Focal Distance 14mm Brightness F2.8 diagonal angle 90 ° (*attached to ISTD) Number of squeezed feather 6 sheets minimum aperture F22 Maximum shooting magnification 0.19 times Filter diameter 77mm Maximum diameter x length 83.5 x 69mm Mass 420g (lens body) Accessories Hanagata food, case