The Lens Distortion Tool allows you to recreate the distortion found in some types of older lenses. Anamorphic lenses are famous for their distortion at wide focal lengths.

Distortion: Controls the amount of distortion. Positive values create what is known as "barrel" distortion. Negative values create "pincushion" distortion. This parameter is also adjustable by grabbing the solid circle HUD that appears over the image.

Flatten: This parameter controls how flat the distortion appears. High values push more of the distortion effect to the edges of the image.