The day after Christmas was also the traditional day on which the aristocracy distributed presents (boxes) to servants and employees  a sort of institutionalized Christmas-bonus party. The servants returned home, opened their boxes and had a second Christmas on what became known as Boxing Day.
300 mm. For a 35 mm camera with a diagonal of 43 mm, the most commonly used normal lens is 50 mm, but focal lengths between about 40 and 58 mm are also considered normal. The 50 mm focal length was chosen by Oskar Barnack, the creator of the Leica camera.
Lets start with an easy one. This refers to the focal length of your lens. 18mm is wide angle, and 55mm is more zoomed. When you zoom your lens in, youâre zooming between 18mm and 55mm. The âmmâ stands for millimeter, and this is the distance between your cameraâs sensor, and the point of convergence in the lens.ets start with an easy one. This refers to the focal length of your lens. 18mm is wide angle, and 55mm is more zoomed. When you zoom your lens in, youâre zooming between 18mm and 55mm. The âmmâ stands for millimeter, and this is the distance between your cameraâs sensor, and the point of convergence in the lens.