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.
A zoom lens with a focal length of 18â55 mm offers the widest picture angle at 18 mm and the smallest picture angle at 55 mm. If the only lens available is an 18â55 mm zoom lens but you want wider anglesâsay, for landscape shotsâyou should buy a lens that offers focal lengths shorter than 18 mm, for example, a 10â24 mm lens.