Perspective control or 'PC' lenses are useful for architectural photography, to get rid of converging verticals.All large format and some medium format cameras offer very simple lens movement or 'shift' function built in the camera body itself. For 35mm cameras one has to depend on expensive tilt-shift lenses. Major manufacturers of TS lenses or adapters include Nikon, Canon , Hartblei etc. The Loreo company came up with a cheap and simple PC lens, which can be used stand-alone for most popular SLR brands.
This 3 element lens has two apertures and offers 3.5mm shift off axis in any direction. The lens (and many other innovative gadgets) can be bought directly from http://loreo.com or various other sellers, including Ebay sellers.
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