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2. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

3. Voigtländer Bessa - Wikipedia

   en.wikipedia.org/wiki/Voigtländer_Bessa

   These were succeeded by improved versions that added a folding frame finder (1930–35) and dual-format capability (1932–33, 3.4×5.5 cm; then 1935–37, 4.5×6 cm). [9] The 1935 model was the basis for the Bessa Rangefinder, which added improved lenses and a coupled rangefinder to assist in setting focus. [10]

4. 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 ...

5. German designations of foreign artillery in World War II

   en.wikipedia.org/wiki/German_designations_of...

   4.5 cm Panzerabwehrkanone 184(r) 45 mm anti-tank gun M1932 (19-K) 4.5cm PaK 184/1(r) 4.5 cm Panzerabwehrkanone 184/1(r) 45 mm anti-tank gun M1937 (53-K) 4.5cm PaK 184/6(r) 4.5 cm Panzerabwehrkanone 184/6(r) 45 mm anti-tank gun M1932 (19-K) 4.7cm PaK 185(b) 4.7 cm Panzerabwehrkanone 185(b) Canon anti-char de 47mm Fonderie Royale de Canons ...

6. 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.

7. Aspect ratio (image) - Wikipedia

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

   Common aspect ratios used in film and display images. The common film aspect ratios used in cinemas are 1.85:1 and 2.40:1. [1] Two common videographic aspect ratios are 4:3 (1. 3:1), [a] the universal video format of the 20th century, and 16:9 (1. 7:1), universal for high-definition television and European digital television.