Sigma AF 20mm f/1.8 EX DG ASPHERICAL RF
Sigma AF 20mm f/1.8 EX DG ASPHERICAL RF is a auto focus wide angle lens for full frame cameras.
Wide open, subjects located outside the depth of field are shown very blurred. Has 9 aperture blades, with this amount of aperture blades you will be satisfied with the result.
82 mm lens filter diameter, finding lens in this range can be expensieve consider using Cokin system if you really need one. Weights 520 grams so plan ahead, carry only if really necessary. 87 mm long, requires consideration if you want to carry in the camera bag.