---
title: distortionCoefficients
framework: coremedia
role: symbol
role_heading: Instance Property
path: coremedia/cmformatdescription/extensions-swift.struct/value/cameracalibrationdatalenscollection/calibration/distortioncoefficients
---

# distortionCoefficients

The first and second radial distortion coefficients (k1 and k2) used to correct the distortion that appeared as curved lines for straight lines and the first and second tangential distortion coefficients (p1 and p2) used to correct the distortion caused by a lens’s improper alignment of physical elements.

## Declaration

```swift
var distortionCoefficients: SIMD4<Float>
```