Nuke :- Lens Distortion

Lens Distortion - The LensDistortion nodeestimates the lens distortion in a given image, either through Grid Detection or manual Line Detection. The warp can then be used to add or remove distortion or produce an STMap in the motion channel for use elsewhere.

Undistort: This removes distortion from an image. You can either manually set the parameters or use a grid pattern to calculate them automatically.
Distort: This adds distortion to an image, useful for matching the look of a particular lens.
Using the LensDistortion Node:

Create a LensDistortion node
Choose the operation mode (Undistort or Distort) from the node's properties panel.
Set the distortion parameters manually or use a grid pattern to auto-calculate them.

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