This exciting prime provides ultra wide-angle coverage up to 113deg. angle of view which is the widest in its class. The tiny size & light weight match perfectly with mirrorless cameras and are suitable to use with gimbals. 2 aspherical elements plus 3 extra-low dispersion elements successfully correct the chromatic aberration, realize a close-to-zero distortion & deliver a corner to corner sharpness.Focal Length9mmAngle Of View113 deg.35mm Equivalent Focal Length14.4mmCoverageN/AMinimum Aperturef/22Maximum Aperturef/2.8Maximum Magnification0.13xLens CoatingFrog Eye CoatingAspherical Elements2ED Glass ElementsN/AFilter Size49mmLens Elements / Groups15 elements / 10 groupsDiaphragm Blades7Dimensions60 x 53mm (2.36 x 2.09")Weight215g (7.58 oz)