We have reported a photoelectron imaging and ab initio study of the angular distributions in SO  photodetachment accessing the X 3   , a 1 , and b 1 Σ + electronic states of SO, and discussed the results in comparison to the PADs determined previously for O2  . Taking a bird's eye view of the experimental data for the three transitions in aggregate, the observed  vs. eKE anisotropy curve follows the general trend expected for π * orbital photodetachment, but compared to O2  , the minimum of the SO  curve is shifted to smaller eKE.