Panoramic photography is a technique of photography, using specialised equipment or software, that captures images with elongated fields of view. It is sometimes known as wide format photography . The term has also been applied to a photograph that is cropped to a relatively wide aspect ratio. While there is no formal division between "wide-angle" and "panoramic" photography, "wide angle" normally refers to a type of lens, but this lens type does not necessarily image a panorama. An image made with an ultra wide angle fisheye lens covering the normal film frame of 1:1.33 is not automatically considered to be a panorama. An image showing a field of view approximating, or greater than, that of the human eye – about 160° by 75° – may be termed panoramic. This generally means it has an aspect ratio of 2:1 or larger, the image being at least twice as wide as its height. The resulting images take the form of a wide strip. Some panoramic images have aspect ratios of 4:1 and sometimes 10:1, covering fields of view of up to 360 degrees. Both the aspect ratio and coverage of field are important factors in defining a true panoramic image.
Photo-finishers and manufacturers of Advanced Photo System (APS) cameras use the word "panoramic" to define any print format with a wide aspect ratio, not necessarily photos that encompass a large field of view. In fact, a typical APS camera in its panoramic mode, where its zoom lens is at its shortest focal length of around 24 mm, has a field of view of only 65°, which many photographers would only classify as wide angle, not panoramic.
History
One of the first recorded patents for a panoramic camera was submitted by Joseph Puchberger in Austria in 1843 for a hand-cranked, 150° field of view, 8-inch focal length camera that exposed a relatively large Daguerreotype, up to 24 inches (610 mm) long. A more successful and technically superior panoramic camera was assembled the next year by Friedrich von Martens in Germany in 1844. His camera, the Megaskop, added the crucial feature of set gears which offered a relatively steady panning speed. As a result, the camera properly exposed the photographic plate, avoiding unsteady speeds that can create an unevenness in exposure, called banding . Martens was employed by Lerebours, a photographer/publisher. It is also possible that Martens camera was perfected before Puchberger patented his camera. Because of the high cost of materials and the technical difficulty of properly exposing the plates, Daguerreotype panoramas, especially those pieced together from several plates (see below) are rare.
After the advent of wet-plate collodion process, photographers would take anywhere from 2 to a dozen of the ensuing albumen prints and piece them together to form a panoramic image ( see: Segmented ). This photographic process was technically easier and far less expensive than Daguerreotypes. Some of the most famous early panoramas were assembled this way by George Barnard, a photographer for the Union Army in the American Civil War in the 1860s. His work provided vast overviews of fortifications and terrain, much valued by engineers, generals, and artists alike. ( see Photography and photographers of the American Civil War )
Following the invention of flexible film in 1888, panoramic photography was revolutionised. Dozens of cameras were marketed, many with brand names heavily indicative of their time. Cameras such as the Cylindrograph, Wonder Panoramic, Pantascopic and Cyclo-Pan, are some examples of panoramic cameras.
Panoramic cameras and methods
Short rotation (or swing-lens)
Short rotation is a term used to define cameras that have a lens that rotates around the camera's rear nodal point (the optical point from which the focal length is measured) opposite a curved film plane. As the photograph is taken, the lens pivots around its nodal point while a slit exposes the vertical strip of film that is aligned with the axis of the lens. The entire exposure usually takes a fraction of a second and the camera's functions similarly to the method of viewing a scene by turning one's head from side to side on a steady level. It is also referred to as rotating lens or swing lens . Typically, these cameras capture a field of view between 110° to 140° and an aspect ratio of 2:1 to 4:1. The images produced commonly take up 1.5 to 3 times as much space on the negative as the exposure made by traditional 35 mm cameras.
Notable cameras of this type include the Widelux, Noblex, and the Horizon They have a negative size of approximately 24x58 mm. The more obscure Russian "Spaceview FT-2", originally an artillery spotting camera, produced even wider negatives, 12 exposures on a 36-exposure 35 mm film.
Short rotation cameras have a number of limitations. They usually offer relatively few shutter speeds and have poor focusing ability, with most models having a fixed focus, set to the hyperfocal distance of the maximum aperture of the lens, often at 10 meters (30 ft) or more.
Thus, panoramic photographers wishing to photograph closer subjects must use a small aperture to bring the foreground into focus, limiting the camera's use in low-light situations. For these reasons, cameras of this type are most often used outside, specifically for landscape or kite photography, where there is usually plenty of available light and there is less requirement for short focusing depths.
Rotating lens cameras also produce a notable and odd distortion of straight lines. If the horizon, for instance, is placed even slightly off-center, the horizon line will bow slightly in the opposite direction. This 'distortion' looks unusual to the viewer because the image, which was originally viewed and captured from a sweeping, curved perspective, is being viewed flat. To view the resulting image correctly, the viewer would have to produce a sufficiently large print and curve it identically to the curve of the film plane in the camera. This type of 'distortion' can be reduced by using a swing-lens camera with a 'normal' focal length lens , and by photographing buildings from a corner location, not from the center of a flat surface.
Swing lens panoramic cameras have also been built --in small to very large sizes-- for use while suspended by kites .
Full rotation
Rotating panoramic cameras (also referred to as slit scan or scanning cameras ) are similar to swing-lens or short rotation cameras, but are capable of 360° of rotation or more. The whole camera rotates. A clockwork or motorized mechanism rotates the camera continuously and evenly and simultaneously pulls the film through the camera so the motion of the film matches the motion of the image movement across the image plane. Exposure is made through a narrow slit. Using the central part of the image field produces a very sharp picture that is consistent across the frame. These cameras are widely used for group pictures, particularly of athletic teams. Digital rotating line cameras image a 360° panorama line by line. A linear sensor has 10,000 sensor elements that use charge-coupled device technology. A 360° panorama is composed of approximately 120,000 individual `line images'. For this example, the final image has approximately 1,200 million pixels. Digital rotating line cameras are used for documenting historic buildings or sites.
Notable digital cameras in this style are the Panoscan and Eyescan. Analogue cameras include the Cirkut, Hulcherama, Leme, Roundshot and Globuscope, all of which are capable of 360° of rotation.
Panoramic photography is commonly used in theatre to photograph the entire cast. Traditionally, the cast will have a "runner" who will appear on both sides of the photograph by running to the other after the camera has moved past them.
Fixed lens
Fixed lens cameras, also called flatback and wide view or "wide field", are panoramic cameras that have fixed, stationary lenses and a flat image plane. These are the most common form of panoramic camera and range from inexpensive APS cameras to sophisticated 6x17 cm and 6x24 cm medium format cameras. Panoramic cameras using sheet film are available in formats up to 10x24 inches. APS or 35 mm cameras produce images in a panoramic aspect ratio using a small area of film, thereby
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