PANCRATIC SYSTEM Russian patent published in 2018 - IPC G02B15/16 

FIELD: physics.

SUBSTANCE: pancratic system consists of three components, the first and the third components of which are positive, and the second component is negative. The first component is fixed and contains three single lenses, the first one - positive and the third one - negative. The second and the third components are installed to move along the optical axis. The distance between the second and the third lenses of the first component is not less than 0.1 of its focal length. The second component is made in the form of two identical biconcave lenses. The third component is in the form of a biconvex lens. The focal lengths of the second f'₂ and the third f'₃ components are related by the relation: -0.3f'₃<f'₂<-0.2f'₃, and the distance L between the fixed planes of objects and images is L=4(f'₂+f'₃).

EFFECT: increase in magnification of the system while reducing the total length of the system and the value of displacements of the movable components.

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