Photography paper sizes

Standard photographic sizes are often named with a format ‘nR’, where the number ‘n’ represents the length of the shortest side in inches. In the normal series, the longest side is the length of the shortest side plus 2 inches, when it is 10 inches or less. When it is 11 inches and above, 3 inches is added to the shortest side. There is an alternative Super series, which is named with a format ‘SnR’. This series has an aspect ratio of approximately 3:2. The aspect ratios of photographic prints tend to vary, so exact scaling of prints is not always a possibility. The Japanese photographic standard are the same print sizes, but are known by different names. For example, the Japanese L corresponds to 3R, while 2L matches 5R.