Destructive interference from three partially coherent point sources

A simple experiment performed with a three-pinhole interferometer is presented. It is shown that, as predicted by Gbur, Visser, and Wolf [Opt. Commun. 239 (2004) 15], complete destructive interference can take place even if the fields emerging from the pinholes are not fully coherent with respect to each other. An intuitive interpretation of this effect is suggested.