The Lens Distortion effect simulates a distorted lens through which the clip is viewed.

Curvature

Changes the curvature of the lens. Specify a negative value to make the image concave, or a positive value to make the image convex.

Vertical and Horizontal Decentering

Displace the focal point of the lens, making the image bend and smear. At extreme settings, the image wraps in on itself.

Vertical and Horizontal Prism FX

Create a result similar to vertical and horizontal decentering, except that at extreme values the image doesn’t wrap in on itself.

Fill Color

Specifies the background color.

Fill Alpha Channel

Makes the background transparent so that underlying tracks are visible. In the Effect Controls panel, click Setup to access this option.