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The High Energy Stereoscopic System (H.E.S.S.) is an array of five ImagingAtmospheric Cherenkov Telescopes (IACTs) designed to detect cosmogenicgamma-rays with very high energies. Originally consisting of just fouridentical IACTs (CT1-4) with an effective mirror diameter of 12$\,$m each, itwas expanded with a fifth IACT (CT5) with a mirror diameter of 28$\,$m in 2012.Being the largest IACT worldwide, CT5 allows to lower the energy threshold ofH.E.S.S., making the array sensitive at energies where space-based detectorsrun out of statistics. Events can be analysed either monoscopically (i.e. usingonly information of CT5) or stereoscopically (requiring at least two triggeredtelescopes per event). To achieve a good performance, a sophisticated eventreconstruction and analysis framework is indispensable. This is particularlyimportant for H.E.S.S. since it is now the first IACT array that consists ofdifferent telescope types. An advanced reconstruction method is based on asemi-analytical model of electromagnetic particle showers in the atmosphere(model analysis). The properties of the primary particle are reconstructed bycomparing the image recorded by each triggered telescope with the Cherenkovemission from the shower model using a log-likelihood maximisation. Due to itsperformance, this method has become one of the standard analysis techniquesapplied to CT1-4 data. Now it has been modified for use with the five-telescopearray. We present the adapted model analysis and its performance in bothmonoscopic and stereoscopic analysis mode.

Photon Reconstruction for H.E.S.S. Using a Semi-Analytical Shower Model