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Large format lenses are photographic optics that provide an image circle large enough to cover the large format film or plates used in large format cameras.. Photographic optics generally project a circular image behind that is only required to have acceptable correction of aberrations over the intended film/sensor diagonal with little room to spare.
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 ...
Rodenstock lenses for large-format cameras; L–R: Grandagon-N 115 mm f /6.8, Apo-Sironar-S 210 mm f /5.6, Grandagon-N 90 mm f /4.5 Rodenstock Photo Optics traces its origins to a mechanical workshop founded in 1877 by Josef Rodenstock and his brother Michael in Würzburg, Germany.
The Fine-Art XXL line is designed for ultra-large format shooting, covering 20×24 inches. Both lenses are large and heavy, but are designed with exceptional image quality and a huge 900 mm circle of coverage in mind. The 550 mm lens is a 6/2 construction, giving 78° of coverage, while the 1100 mm lens is 4/4 with 45.7° of coverage.
The image sensor format of a digital camera determines the angle of view of a particular lens when used with a particular sensor. Because the image sensors in many digital cameras are smaller than the 24 mm × 36 mm image area of full-frame 35 mm cameras, a lens of a given focal length gives a narrower field of view in such cameras.
35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...
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