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Pointing calibration is an offline correction applied in order to obtain thetrue pointing direction of a telescope. The Cherenkov Telescope Array (CTA)aims to have the precision to determine the position of point-like as well asslightly extended sources, with the goal of systematic errors less than 7 arcseconds in space angle. This poster describes the pointing calibration conceptbeing developed for the CTA Medium Size Telescope (MST) prototype atBerlin-Adlershof, showing test results and preliminary measurements. The MSTpointing calibration method uses two CCD cameras, mounted on the telescopedish, to determine the true pointing of the telescope. The "Lid CCD" is alignedto the optical axis of the telescope, calibrated with LEDs on the dummygamma-camera lid; the "Sky CCD" is pre-aligned to the Lid CCD and thetransformation between the Sky and Lid CCD camera fields of view is preciselymodelled with images from special pointing runs which are also used todetermine the pointing model. During source tracking, the CCD cameras recordimages which are analysed offline using software tools including Astrometry.netto determine the true pointing coordinates.

Pointing Calibration for the Cherenkov Telescope Array Medium Size Telescope Prototype