Total transmission including telescope, atmosphere, and detector quantum efficiency. The transmission of ERIS/SPIFFIER (thick curves) is compared to that for SINFONI (thinner darker curves for pre-2016, and grey curves for the situation after the upgrade when replacement of the filters led to an increase in transmission). The data are averaged from several observations of the spectrophotometric standard star LTT 3218 in seeing-limited conditions, and were extracted in a large aperture. The transmission curves do not reflect gains due to the improved spectral line profile or AO performance.