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The Large High Altitude Air Shower Observatory project is proposed to studyhigh energy gamma ray astronomy ( 40 GeV-1 PeV ) and cosmic ray physics ( 20TeV-1 EeV ). The wide field of view Cherenkov telescope array, as a componentof the LHAASO project, will be used to study energy spectrum and compositionsof cosmic ray by measuring the total Cherenkov light generated by air showersand shower maximum depth. Two prototype telescopes have been in operation since2008. The pointing accuracy of each telescope is crucial to the directionreconstruction of the primary particles. On the other hand the primary energyreconstruction relies on the shape of the Cherenkov image on the camera and theunrecorded photons due to the imperfect connections between photomultipliertubes. UV bright stars are used as point-like objects to calibrate the pointingand to study the optical properties of the camera, the spot size and thefractions of unrecorded photons in the insensitive areas of the camera.

Geometry and optics calibration of WFCTA prototype telescopes using star light