Tilt-shift photography refers to the use of camera movements on small- and medium-format cameras, and sometimes specifically refers to the use of tilt for selective focus, often for simulating a miniature scene. Sometimes the term is used when the shallow depth of field is simulated with digital post processing; the name may derive from the tilt-shift lens normally required when the effect is produced optically.
Nikon introduced a lens providing shift movements for their 35 mm SLR cameras in the mid 1960s, and Canon introduced a lens that provided both tilt and shift movements in 1973. Canon and Nikon each currently offer several lenses that provide both movements. Such lenses are frequently used in architectural photography to control perspective, and in landscape photography to get an entire scene sharp.
The Daily Omnivore 
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