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11.0, 10.5, 10.0, 9.0, 8.0 or later
lensKernelCheap is a tool to replicate the effect of Bob Roesler's Lens Kernel FFT gizmo, but make it much more efficient. On a 3840x2400 test image, lensKernelCheap was about 10 times faster than LensKernelFFT according to Nuke's performance profiling, making it far easier to work with in a comp script.
The original tool is a good way to add some realistic lens effects, but it's pretty heavy for what is mostly just a softening filter.
It achieves this by just mixing a bunch of blurs together with slight offsets, which were manually adjusted and balanced to match the FFT version. The only time I've really noticed significant differences between them is on shots with super high values that would start to reveal glints in the HDR image kernel, and that lensKernelCheap doesn't have the same weird border as LensKernelFFT.
As long as this isn't the last node in your comp before a write node, go crazy!
Link to original gizmo: LensKernelFFT