PANCRATIC LENS Russian patent published in 2011 - IPC G02B15/14 

FIELD: physics.

SUBSTANCE: lens has at least four groups of lenses configured to move when changing the focal distance. The first, third and fourth groups of lenses have positive optical power. The second group of lenses has negative optical power. The following relationships are satisfied: 0.7 < (β_2t · β_3w) / (β_2w · β_3t) < 1-0, 4.8 < β_3t / β_3w < 6.6, where β_2w and β_2t are lateral magnification of the second group in the wide-angle and long-focus position, respectively; β_3w and β_2t are lateral magnification of the third group in the wide-angle and long-focus position.

EFFECT: wide range of focal distances and improved aberration correction owing to more rational distribution of magnifications and the magnification range between groups of lenses.

9 cl, 3 dwg, 3 tbl