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For many years the FORS2 instrument has suffered from artefacts in the flatfields caused by surface inhomogeneities on the longitudinal atmosphericdispersion corrector (LADC) that affected high-precision photometric andspectroscopic measurements. Recently, the FORS LADC prisms were exchanged, andour analysis of a large number of flat fields shows that this exchange hasresulted in a significant decrease in the level of small-scale artefacts.

FORS2 Rotating Flat Field Systematics Fixed -- Recent Exchange of FORS LADC Prisms Improves the Long-known Flat-fielding Problem