Аннотация:A new Cherenkov telescope of the SPHERE type is under development. Its main goal is topromote the solution of the problem of the primary cosmic ray mass composition at ultra highenergies (1–100 PeV) using a newly developed technique of the primary mass assignment to EASevent on event-by-event basis. The telescope will carry out measurements of both the Cherenkovlight reflected from the snow surface as well as the direct one. Sensitivity of the direct Cherenkovimages’ shapes to the primary mass is demonstrated.