Patent ID: 6067194
Filing Date: 2000-05-23
Classification: G02B

Abstract:
An image stabilizing optical instrument, comprising:a housing (9; 43);a cardanic part (11; 49) connected to the housing via a suspension for rotary motion about a first pivot axis (12; 50); andan objective lens system (2; 37), a first optical element (3; 38) including a reflecting surface, and a second optical element (4; 40) including at least one reflecting surface, along a light path, wherein at least some part of the objective lens system (2; 37) and the first optical element (3; 38) are fastened together to constitute a unit (22; 58) that is connected to the cardanic part (11; 49) via suspension for rotary motion about a second pivot axis (25; 44), the second optical element (4; 40) being fastened to the cardanic part (11; 49);the objective lens system having an unstabilized part (106) and a stabilized part, wherein the unstabilized part (106) has a difference in focal length between two wavelengths to at least partly compensate for chromatic aberration caused by refraction in the instrument when said stabilized part of the instrument is decentered.