A recent report examined the role of electron-dipole interactions in CN  photodetachment. The theoretical framework developed there applied to  orbital photodetachment, but similar effects can be expected for any photodetachment transition which leaves a significantly polar neutral residue. In the present work, we use photoelectron imaging spectroscopy and theoretical modeling to examine the angular distributions in the photodetachment of the sulfur monoxide anion, SO  . The results show that consideration of dipole effects is important for agreement between theory and experiment. Similar to CN  , the SO  PADs are not just signatures of the parent detachment orbitals-they also carry fingerprints of the exit-channel interactions between the departing electron and the neutral residue. Although the dipole moments of SO and CN are similar (1.45 and 1.55 Debye, respectively), the highest-occupied molecular orbitals have different character (π * and , respectively), and this work offers the first extension of the previously published formalism to non- detachment orbitals. It also allows us to compare the SO  PADs to the extensively studied anion of superoxide, O2  , 9-12 a benchmark system in which no dipole effects are present. The comparison aims to establish which of the two factors contributing to the PAD differences plays a more determining role: the distinct shapes of the detachment orbitals or the exit-channel interactions. This work demonstrates that in the SO  vs. O2  it is the latter.