This is a DIY gunstock mount for my camcorder, a Sanyo Xacti VPC-FH1. It is fitted with a Red Dot Sight. This video shows the contraption in action, first illustrating how it is used to follow a moving target, a cow(too difficult to follow a bird with another camera in the way). The resulting clip of the cow follows, and then there are examples of birds in flight, first at normal speed and then in slow motion. The birds are a Jay, and then a Hobby mobbing a Buzzard, a quarter mile away. The device allows you to very quickly line up on and follow a moving target. Four of my other videos here are taken using it, the Peregrines catching a pigeon, Newent Lanner, Barn Owl and Polecat.