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For the current generation of Imaging Atmospheric Cherenkov Telescopes(IACTs), with their large mirrors and their cameras with fine segmentation ofphotodetectors, the focusing capability is a relevant issue. The optical systemof an IACT has a limited depth of field. Therefore, focusing the telescopesclose to the shower maximum in the atmosphere has a significant impact on thedata acquisition and analysis. As the distance of the shower maximum to thetelescope depends (among others) on the zenith angle, an adjustable focus wouldbe desirable. The fifth Cherenkov telescope of the H.E.S.S. II array isequipped with a focus system which allows to adjust the position of the cameraalong the optical axis, possibly during data taking. This impact has beenstudied on gamma-ray Monte Carlo simulations, and the results in terms ofgamma-ray trigger rate, energy reconstruction and gamma-ray effective area willbe shown.

Enhanced H.E.S.S. II low energies performance thanks to the focus system