Description:With its large aperture opening up to F2.8, it has a high light intensity and allows precise recording even in poor light conditions.The lens is multi-layered, its body made of metal is high-quality processed and can be adjusted comfortably and easily.It is wide angle lens, suitable for both Astrophotography, Landscape and Architectural Photography.Please kindly note the manual focus lens can't be recognised by camera unless coming with the camera setting "release without lens"The equivalent focal length is around 18mm.Constructed of 12 glass elements in 10 groups with aperture range of f2.8 - f22Minimum focusing distance of only 3.94 inchesBuilt for Mirror less cameras; takes a 72mm filter sizeIt is wide angle lens,suitable for both Astrophotography, Landscape and Architectural PhotographyIncludes removable lens hood,lens pouchSpecifications:Multi-layer Coating9 diaphragm blades provide a circular apertureLens Structure:10 Groups 12 ElementsNumber of aperture blades:9 bladesMinimum Focus Distance:15cmFilter Thread Size:72mmAperture Range:F2.8-F22Lens Diameter:78mm​Focal Length:12mmAngle of View:99°Length:65.8mmWeight:360g