A spectroscopy apparatus comprising: a support for a sample; a light source arranged to generate a light profile on the sample; the support and light source arranged such that the light profile is movable relative to the sample; an optical input for receiving light generated by interaction of the sample with light from the light source; a detector comprising a two-dimensional array of photodetector elements; a dispersive device arranged between the optical input and the detector to spectrally disperse light received by the optical input in a spectral direction across the detector; and an optical splitter arranged in an optical path between the optical input and the detector to split light based upon wavenumber such that light of different wavenumber ranges travels to the detector along different first and second optical paths (48A, 48B), characterised by a controller, arranged to control shifting of data between the photodetector elements in a spatial direction, perpendicular to the spectral direction, synchronously with relative movement between the light profile and the sample; and a blocking filter arrangement for filtering light received by the optical input, the blocking filter arrangement filtering wavenumbers directed by or that otherwise would be directed by the optical splitter along the first optical path and wavenumbers directed by or that otherwise would be directed by the optical splitter along the second optical path such that first and second portions (50A, 50B) of a spectrum generated by a given point on the sample, which occur across a spectral range that is greater than the spectral range provided by a width of the detector in the spectral direction, are directed to photodetector elements of the detector so that data on each of the first and second portions (50A, 50B) of the spectrum accumulates across different sets of photodetector elements of the detector during the relative movement. a support for a sample; a light source arranged to generate a light profile on the sample; the support and light source arranged such that the light profile is movable relative to the sample; an optical input for receiving light generated by interaction of the sample with light from the light source; a detector comprising a two-dimensional array of photodetector elements; a dispersive device arranged between the optical input and the detector to spectrally disperse light received by the optical input in a spectral direction across the detector; and an optical splitter arranged in an optical path between the optical input and the detector to split light based upon wavenumber such that light of different wavenumber ranges travels to the detector along different first and second optical paths (48A, 48B), characterised by a controller, arranged to control shifting of data between the photodetector elements in a spatial direction, perpendicular to the spectral direction, synchronously with relative movement between the light profile and the sample; and a blocking filter arrangement for filtering light received by the optical input, the blocking filter arrangement filtering wavenumbers directed by or that otherwise would be directed by the optical splitter along the first optical path and wavenumbers directed by or that otherwise would be directed by the optical splitter along the second optical path such that first and second portions (50A, 50B) of a spectrum generated by a given point on the sample, which occur across a spectral range that is greater than the spectral range provided by a width of the detector in the spectral direction, are directed to photodetector elements of the detector so that data on each of the first and second portions (50A, 50B) of the spectrum accumulates across different sets of photodetector elements of the detector during the relative movement.