I was interested to find out what the difference was between filming with and without the Yi’s inbuilt lens distortion correction, once additional correction of the barrelling from the wide-angle lens had been corrected in After Effects.
|The images on the left are taken without the Yi’s distortion correction, and all correction in the lower image in AE, using Optics Compensation effect, FOV 74, Reverse Lens Direction on.||The images on the right are taken with the Yi’s distortion correction. Further, correction in AE, using Optics Compensation effect, FOV 48, Reverse Lens Direction on.|
The result (once all barrelling is removed) is very similar between the two. However, as the correction entirely in AE means that the image is being digitally blown up, a better image quality is probably obtained by using the camera’s inbuilt correction.
Additionally, when using the camera’s distortion correction the raw footage has less distortion in more distant objects. For some footage without near objects with identifying barreling features (such as straight lines), it may be possible to avoid using the AE effect entirely.