Patent ID: 6072630
Filing Date: 2000-06-06
Classification: G02B

Abstract:
An optical system for an observing apparatus having an image vibration compensation system, said optical system comprising:an objective optical system for forming an image of an object, said objective optical system including a first lens having positive refractive power, a second lens having negative refractive power and a third lens having positive refractive power, said third lens having at least one aspherical surface, said first, second and third lenses being arranged in that order from an object side, said third lens being movable in a direction orthogonal to an optical axis of said objective optical system;an erecting system for erecting said image formed by said objective optical system; andan observing optical system for observing the image erected by said erecting system, wherein the following relationship is satisfied:D.sub.12 /f.sub.0 <0.16,where,D.sub.12 is a distance between an object side surface of said first lens and an image side surface of said second lens, andf.sub.0 is a focal length of said objective optical system.