Hotshoe laser sight

In the night, when you're using long focus distances (>70), it's not easy to know where are you exactly pointing at with the camera. This thing allows you to attach a cheap green laser (such as https://www.dx.com/p/powerful-5mw-532nm-green-laser-pen-laser-pointer-presenter-remote-lazer-hunting-laser-bore-sighter-without-battery-black-2021246.html#.Xa7Uu-czZ24) to the camera.