  We check the performance of the FRODOSpec integral-field spectrograph for
observations of faint sources in crowded fields. Although the standard
processing pipeline L2 yields too noisy fibre spectra, we present a new
processing software (L2LENS) that gives rise to accurate spectra for the two
images of the gravitationally lensed quasar Q0957+561. Among other things, this
L2LENS reduction tool accounts for the presence of cosmic-ray events,
scattered-light backgrounds, blended sources, and chromatic source
displacements due to differential atmospheric refraction. Our non-standard
reduction of Q0957+561 data shows the ability of FRODOSpec to provide useful
information on a wide variety of targets, and thus, the big potential of
integral-field spectrographs on current and future robotic telescopes.
