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If you want an ultra-wide angle lens which has surprisingly little distortion, try out Sony's remarkable 12-24mm GM.   It is a fantastic lens and worth the price.   I also have the excellent 20mm -- great little lens! -- and a TTArtisans 11mm fisheye.  When I know I am going to want to deliberately show distortion, I reach for the fisheye.   When I want to shoot something and avoid distortion as much as possible, the 12-24mm is on the camera.