Large format (photography)

Large format refers to any imaging format of 4×5 inches (102×127 mm) or larger. Large format is larger than "medium format", the 6×6 cm (2¼×2¼ inch) or 6×9 cm (2¼×3½ inch) size of Hasselblad, Rollei, Kowa, and Pentax cameras (using 120- and 220-roll film), and much larger than the 24×36 mm (~ 1.0x1.5 inch) frame of 35 mm format. The main advantage of large format, film or digital, is higher resolution at the same pixel pitch, or same resolution with more larger pixels or grain. A 4×5 inch image has about 16 times the area, and thus 16× the total resolution, of a 35 mm frame.

Large format cameras were some of the earliest photographic devices, and before enlargers were common, it was normal to just make 1:1 contact prints from a 4×5, 5×7, or 8×10-inch negative.

The most common large format is 4×5 inches, which was the size common cameras used in the 1930s-1950s, like the Graflex Speed Graphic and Crown Graphic, among others. Less common formats include quarter-plate, 5×7 inches, 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, to much later Sinar monorail studio cameras) are 11×14 inches, 16×20 inches, 20×24 inches, various panoramic or "banquet" formats (such as 4×10 and 8×20 inches), and metric formats, including 9×12 cm, 10×13 cm, and 13×18 cm and assorted old and current aerial image formats of 9×9 inches, 9×18 inches (K17, K18, K19, K22 etc.), using roll film of 4, 5, 6, 7, 9, or 10 inches width or, view cameras (including pinhole cameras), reproduction/process cameras, and x-ray film.

Above 8×10 inches, the formats are often referred to as Ultra Large Format (ULF) and may be 11×14, 16×20, or 20×24 inches or as large as film, plates, or cameras are available. Many large formats (e.g., 24×24, 36x36, and 48x48 inches) are horizontal cameras designed to make big negatives for contact printing onto press-printing plates.

The Polaroid 20×24 camera is one of the largest format instant cameras in common usage and can be hired from Polaroid agents in various countries. Many well-known photographers have used the 235 pounds (107 kg), wheeled-chassis Polaroid.

...
Wikipedia