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I'm answering instead of a comment just to upload two images

with k1 > 0

with k1<0

Following the wiki the effect should be the opposite as @Stringweasel pointed out

...typically k1>0 and pincushion distortion (typically k1<0)...

The vectors I used are, respectively,

D_00 = np.array([ 0.25, 0.0, 0.0, 0.0, 0.0], dtype=np.float64)
D_00 = np.array([ -0.25, 0.0, 0.0, 0.0, 0.0], dtype=np.float64)

Does anyone have a clue about what's going on?