The wide-field optical telescopes MeerLICHT and BlackGEM feature an atmospheric dispersion corrector (ADC) which is fully integrated in its three-lens field corrector. Atmospheric dispersion is compensated for through lateral displacement of one of the three lenses. In this contribution, we discuss the on-sky calibration and performance of the ADC of the MeerLICHT telescope. We use a novel technique where we determine the optimal position of the ADC lens by minimising colour-dependent offsets on the astrometry of thousands of stars in an image.
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