  We study moderate gravitational lensing where a background galaxy is
magnified substantially, but not multiply imaged, by an intervening galaxy. We
focus on the case where both the lens and source are elliptical galaxies. The
signatures of moderate lensing include isophotal distortions and systematic
shifts in the fundamental plane and Kormendy relation, which can potentially be
used to statistically determine the galaxy mass profiles. These effects are
illustrated using Monte Carlo simulations of galaxy pairs where the foreground
galaxy is modelled as a singular isothermal sphere model and observational
parameters appropriate for the Large Synoptic Survey Telescope (LSST). The
range in radius probed by moderate lensing will be larger than that by strong
lensing, and is in the interesting regime where the density slope may be
changing.
