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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.