Solving Camera Motion in Blender 2.93 Alpha: Calculation of K1 and K2

For the calculation of K1 and K2 within the "Camera Motion Solving" in Blender 2.93, there's now a "Radial Distortion" checkbox:

1) Old setting as in the video (here from Blender 2.90.0):

2) Now in Blender 2.93 Alpha:

"Tangential Distortion" seems to be new.