Close-up performance of the Summicron-M is on the same level as the performance at infinity setting (actually infinity is that distance where the incoming light rays are parallel to the optical axis.
Close-up performance of the Summicron-M is on the same level as the performance at infinity setting (actually infinity is that distance where the incoming light rays are parallel to the optical axis.
近摄表现与无穷远时相当(事实上,无穷远处的光线是平行光轴入射的.对多数镜头而言,大约100倍焦距的物距时,入射光满足这一条件).