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Radial 4th -order Controls
This is the usual lens type for normal non-anamorphic cameras using the Brown- Conrady model, either in the compositing-friendly standard (Std.) version, or the matchmoving-friendly version.
C2 and C4 are symmetric quadratic and quartic distortion coefficients. U2 and V2 are second-order asymmetric misalignment coefficients; U4 and V4 are similarly fourth- order asymmetric misalignment coefficients.
When starting a solve, you might begin solving only for C2 and maybe C4, before moving on to refine with U2 and V2 then maybe U4 and V4.
HCTR, VCTR, and Rolling Shutter are discussed in the Shared Parameters section.
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