Star‐star lensing rates for the improved peak‐threshold trigger on WFPC2, AC, and NGST. The spacing of observations is 1 day, except in the bottom right plot, where it is 6 hr. We have plotted both a typical estimate of the average star mass, 0.4 ﹩M_{\odot }﹩, and an extreme estimate, implying a great number of brown dwarfs, 0.05 ﹩M_{\odot }﹩.