I believe the bokeh varies across the image due to radial distortion in the lens. Since a lens does not always project a rectilinear image, image points towards the far corners of an image will get squished. You can recover the radial distortion coefficients to correct the image through a process called "camera calibration".
I believe the bokeh varies across the image due to radial distortion in the lens. Since a lens does not always project a rectilinear image, image points towards the far corners of an image will get squished. You can recover the radial distortion coefficients to correct the image through a process called "camera calibration".