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Muons produced in Extensive Air Showers (EAS) generate ring-like images inImaging Atmospheric Cherenkov Telescopes when travelling near parallel to theoptical axis. From geometrical parameters of these images, the absolute amountof light emitted may be calculated analytically. Comparing the amount of lightrecorded in these images to expectation is a well established technique fortelescope optical efficiency calibration. However, this calculation is usuallyperformed under the assumption of an approximately circular telescope mirror.The H.E.S.S. experiment entered its second phase in 2012, with the addition ofa fifth telescope with a non-circular 600m$^2$ mirror. Due to the differingmirror shape of this telescope to the original four H.E.S.S. telescopes,adaptations to the standard muon calibration were required. We present ageneralised muon calibration procedure, adaptable to telescopes of differingshapes and sizes, and demonstrate its performance on the H.E.S.S. II array.

A Generic Algorithm for IACT Optical Efficiency Calibration using Muons