Triple extension - camera system in which lens-image distance can be extended by as much as three times its focal length. It is particularly useful for close-up photography.
Double extension vs Triple extension flatbeds
Zone VI vs Wisner vs Canham
Technika vs Graphic
Technika vs Toyo
Sinar vs Arca-Swiss 1/01 ...
100 years ago these lenses were a common option for photo amateurs to give a double or triple extension folding camera more versatility.
The MP-E 65 macro lens uses triple extension to focus (9.5 inches long at 5X). As the magnification ratio and the length of the lens increases, so does the effective F stop number.
 See also: Lens, Element, Image, Haze, Focus
  
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