Macro lens of the telephoto type having three lens groups and front focusing, method for its manufacture

摘要

The macro lens includes, in order from the object, a first lens group (G1), a second lens group (G2), and a third lens group (G3). Combined refractive power of the first lens group (G1) and the second lens group (G2) is positive. The first lens group (G1) and the second lens group (G2) are movable towards the object side for varying focusing from the object locating at infinity to the object locating at a close distance. Each lens group includes one positive lens and one negative lens. Given conditional expressions are satisfied.