What you see is what you get in manual focusing. How come the difference at infinity? Perhaps you mean the lense cannot focus at infinity?

• 楼主师兄，手动镜系会有机会走焦。通常系无限远时发生。镜头内有无限远调整螺丝，最稳阵系揾师父睇下，唔好自己打开支镜。