Sigma 20mm f1.8 EX DG Asp RF Canon AF £260.00
Super wide-angle lens with a large aperture of F1.8 and angle of view 94.5 . It has Macro focusing capability with a minimum focusing distance of 20cm/7.9inches (reproduction ratio 1:4). It incorporates an aspherical lens element in the front as well as rear lens groups, to minimize distortion, spherical aberration and astigmatism. The lens has non-vignetting optical construction, in order to obtain adequate peripheral brightness with ope