A Man at a wedding with a camera

A picture which was obviously taken at a wedding, probably in the late 1960s or early 1970s. The wedding party can be seen in the far left of the picture standing by the entrance to the church, but the subject of the picture is a man holding a camera and taking a shot of the photographer of this picture. I also notice in the background, over his shoulder, is another man with a camera also facing the opposite direction to the wedding party. I wonder what was so interesting ?