  I discuss 3 widely applicable aspects concerning calibration of the near
infrared adaptive optics integral field spectrometer SINFONI: (1) the accuracy
with which one needs to quantify the PSF and how this might be achieved in
practice; (2) how it is possible to fine tune the background subtraction to
minimise the residual OH airglow; and (3) how an altered perspective on
calibration data might lead to improvements in interpolation and greater
flexibility in reconstructing datacubes.
