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2. Aspect ratio (image) - Wikipedia

   en.wikipedia.org/wiki/Aspect_ratio_(image)

   Medium-format cameras typically have format designated by nominal sizes in centimeters (6×6, 6×7, 6×9, 6×4.5), but these numbers should not be interpreted as exact in computing aspect ratios. For example, the usable height of 120-format roll film is 56mm, so a width of 70mm (as in 6×7) yields an aspect ratio of 4:5 — ideal for enlarging ...

3. Display aspect ratio - Wikipedia

   en.wikipedia.org/wiki/Display_aspect_ratio

   The display aspect ratio (DAR) is the aspect ratio of a display device and so the proportional relationship between the physical width and the height of the display. It is expressed as two numbers separated by a colon (x: y), where x corresponds to the width and y to the height. Common aspect ratios for displays, past and present, include 5:4 ...

4. Book size - Wikipedia

   en.wikipedia.org/wiki/Book_size

   Traditional book sizes/formats used in English-speaking countries. Based on the 19-by-24-inch or 482.5-by-609.5-millimetre printing paper size, which equals two folio leaves, four quarto leaves, eight octavo leaves, etc. For comparison, common American letter size is shown in green. Books made by printing two pages of text on each side of a ...

5. Large format - Wikipedia

   en.wikipedia.org/wiki/Large_format

   The most common large format is 4×5 inches (10.2x12.7 cm), which was the size used by cameras like the Graflex Speed Graphic and Crown Graphic, among others. Less common formats include quarter-plate (3.25x4.25 inches (8.3x10.8 cm)), 5×7 inches (12.7x17.8 cm), and 8×10 inches (20×25 cm); the size of many old 1920s Kodak cameras (various versions of Kodak 1, 2, and 3 and Master View cameras ...

6. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   It has the height of Canadian P4 paper (215 mm × 280 mm, about 81⁄2 in × 11 in) and the width of international A4 paper (210 mm × 297 mm or 8.27 in × 11.69 in), i.e. it uses the smaller value among the two for each side. The table shows how this format can be generalized into an entire format series.

7. Medium format - Wikipedia

   en.wikipedia.org/wiki/Medium_format

   The most common aspect ratios are 6×6 cm (square/1:1) and 6×4.5 cm (rectangular/4:3). Other frequently used aspect ratios are 6×7 cm, 6×9 cm, and 6×17 cm panoramic . The 6×4.5 cm format is usually referred to as "645", with many cameras that use this ratio bearing "645" in their product name.

8. 120 film - Wikipedia

   en.wikipedia.org/wiki/120_film

   The wide 6×12, 6×17, and 6×24 cm frames are produced by special-purpose panoramic cameras. Most of these cameras use lenses intended for large format cameras for simplicity of construction. Cameras using 120 film will often combine the numbers of the frame size in the name e.g. Pentax 6×7 (6×7), Fuji 617 (6×17), and many 645 s (6×4.5).

9. Letter (paper size) - Wikipedia

   en.wikipedia.org/wiki/Letter_(paper_size)

   The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s; previously, the smaller "official" Government Letter size, 8 by 10.5 inches (203.2 by 266.7 mm) (aspect ratio: 1.3125), was used in government, while 8.5-by-11-inch (215.9 by 279.4 mm) paper was standard in most other offices. [2]