On the shooting data for this shot it reads 67.7 mm I have not taken any courses of anykind in photography as I tend to learn from logic.So does this mean the focal length is the distance from what the lens first focuses on to 67mm further back? I was about 4 metres away from these ducks. And no Donald you don't have to look at these LOL

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."