Distorted-wave Born approximation calculations have been done for two-neutron transfer reactions, in which the total angular momentum transferred was zero. A finite-range interaction was used, which acted between the proton and each transferred neutron. The results support the conclusions of zero-range calculations, both with respect to the shapes of the angular distributions, and the relative cross sections for transfer into different shells. However, the absolute cross sections, calculated for the 40, 48Ca(t, p)42, 50Ca(g.s.) reactions, were only about a third as large as those observed.