Lens Distortion

This 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 Displaces 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 Creates effects similar to vertical and horizontal decentering, except that at extreme values the image will not wrap in on itself.

Fill color Specifies the background color.

Fill alpha channel When checked, makes the background transparent (useful if the affected clip is superimposed). To access this check box from the Effect Controls palette, click Setup. This option works only if you place the clip in a superimpose track, apply Transparency, and select the Alpha Channel key type.

Applying Effects > Video effects included with Premiere > Lens Distortion