  The recent Sumi et al (2010, 2011) detection of free roaming planet mass
MACHOs in cosmologically significant numbers recalls their original detection
in quasar microlening studies (Schild 1996, Colley and Schild 2003). We
consider the microlensing signature of such a population, and find that the
nano-lensing (microlensing) would be well characterized by a statistical
microlensing theory published previously by Refsdal and Stabel (1991).
Comparison of the observed First Lens microlensing amplitudes with the
theoretical prediction gives close agreement and a methodology for determining
the slope of the mass function describing the population. Our provisional
estimate of the power law exponent in an exponential approximation to this
distribution is $2.98^{+1.0}_{-0.5}.$ where a Salpeter slope is 2.35.
