Lens

Create the effect of looking through a lens.

R, G, B, A Field of View:

quantity of deformation of the relative fields. Often used with Lock to simultaneously affect the 4 fields.

Aspect Ratio:

determines the aspect ratio that you intentionally set.

Radius:

radius of curvature of the distortion. At minimum, it is a sphere (fish eye) and at maximum, it is a rectangle (no distortion).

Center X, Y:

determines the coordinates of the center of the sphere. It can be made visible with Draw Center.

Mode:

determines the type of distortion. The choice is between sphere shrink, sphere stretch, rectilinear shrink and rectlinear stretch.

Interpolation

determines the interpolation algorithm; from the fastest and least precise Nearest, passing through BiLinear to the better BiCubic.