We discuss issues associated with computation and measurement of the spectral response function and spectral uniformity of pushbroom imaging spectrometers. Methods for accurate computation are presented and advantages or pitfalls of particular approaches are identified. We demonstrate the effect to which partial coherence effects can be neglected or approximated through simpler incoherent computations. The results are illustrated with spectral calibration data from a complete sensor.© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.