Double extension vs Triple extension flatbeds
By John Sparks ...
-Double extension - characteristic of large format cameras which enables the bellows to be extended to twice that of the focal length of the lens in use. It is used for close-up photography.- ...
The total bellows draw on the AII is 324mm with double extension (front and rear standards extend independent of each other).
Usually the baseboard is extendible for close-up work and to accommodate various focal length lenses, the double extension feature.
 See also: Extension, Format, Camera, Film, Exposure
  
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