It is recommended that observers take a series of dome flats at approximately each wavelength in which they observe. Because of drift in the zero-point of the λ-Z relation, observers should recompute the appropriate Z value for the wavelengths of interest when taking flats. Using the Quartz High lamp, exposure times of 3-5 seconds should be sufficient (depending on the filter).

In the case of charge shuffling / frequency switching, it is recommended that flats be taken in charge shuffling / frequency switching mode, adjusting the exposure times appropriately.