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.
As for 35 mm cameras, lenses with a length of less than 50 mm are said to be short, though typically these lenses come in focal lengths of 24 mm and 28 mm. Features of Long Lenses. Before a comparison is made between long and short lenses, it is important for the photographer to know the basics regarding long lenses, as presented in the points below.