The optical distortions of the SPHERA series of telescopes have been studied. A spherical mirror creates on the mosaic of the telescope an image which is distorted, compared to the shape of the portrayed object. The farther from the axis of the mirror the object is, the greater the distortion becomes. In fact, there is a compression of the image space in the radial direction. These distortions prevent further processing of the EAS images registered by the PMT mosaic of the telescope. It becomes necessary to compensate for these distortions of the images in order to bring their shape closer to the shape of the objects that are being depicted, in our case - the spots of Cherenkov light on snow from EASs.
96.50.sd Extensive air showers
$^1$Physics Department, M.V. Lomonosov Moscow State University\
$^2$Physics Department, M.V. Lomonosov Moscow State University, space Research Department.
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