Patent ID: 8736975

Claim:
A macro lens system comprising: a stop; a first lens group located in front of the stop, and having a positive refractive power and configured to move during focusing; a second lens group located behind the stop, and having a positive refractive power; a 3-1 lens group located behind the second lens group, having a positive refractive power, and configured to move in a direction perpendicular to an optical axis to correct an image blur; and a 3-2 lens group located behind the 3-1 lens group and having a positive refractive power for correcting a residual aberration, wherein at least one of the following is configured to change during a focusing operation: a distance between the second lens group and the 3-1 lens group and a distance between the 3-1 lens group and the 3-2 lens group, and the macro lens system satisfies the following equation, 2.5≦|Δl OBJ/fOIS|≦10 where, ΔI OBJ denotes a distance from a side surface of a lens of the first lens group that is closest to an object, to the object when the lens system is in a maximum magnification of the object position, and f OIS denotes a distance the first lens group is moved during a focusing operation from an infinity focus position to the maximum magnification of the object position, and wherein the term lens group is used to indicate one or more lenses.