The SmallRig 1.55X Anamorphic Lens for Cellphone 3578 brings a 2.76:1 wide aspect ratio. In comparison with the conventional 16:9 aspect ratio 55% additional horizontal picture is obtained without compression or cropping bringing widescreen visual effect just like what you see in the movie.

SmallRig 1.55x Anamorphic Lens for Smartphones and Tablets
$58.20