Extension bellows.
Device used to provide the additional separation between lens and film required for close-up photography. Consists of extendible bellows and mounting plates at front and rear to fit the lens and camera body respectively.
[1] With a triple-extension bellows 4" x 5" camera such as the Linhof SuperTechnika V, the photographer can correct certain distortions such as 'keystoning', where the image 'lines' converge (i.e.
In addition, you have an enormous lens choice and many film possibilities. Sometimes a large format camera is used as an extra long extension bellows with a 35mm or medium format camera mounted on the back.
for greater magnification than with the lens alone. Usually employed for close-up or macro work. Nikon bellows are the PB-3, PB-4, PB-5 and the latest model PB-6 which can be extended further for higher magnification with the PB-6E extension bellows.
 See also: Lens, Bellows, Camera, Close-up, Mount
  
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