From the Manufacturer
With a Canon TS-E lens, you can control the angle of the plane of focus and the pictures perspective. The effects of large-format camera movements can be obtained with TS-E lenses for EOS cameras. Although manual focusing is required, automatic aperture control enables autoexposure and autoexposure bracketing. The tilt and shift axes intersect at a 90° angle. They can be made parallel at an authorized Canon Service Facility (modified at owners expense).
Telephoto perspective, f/2.8 speed, and full tilt and shift movements in a compact, professional package. Impressively sharp, its ability to alter the plane of focus can provide a "look" that previously required a view camera to achieve. Pros have found it a great option for portraits, products and even fashion work. At its closest focus distance (1.6 ft/0.5m), it gives magnifications of about 1/3 life-size.
Canon--TS-E LENS 90/2.8 Weight - 1.01 lbs. Dimensions - 12.80 (circumference) System Requirements - PC - Windows 7, Windows Vista, XP Home Edition or XP Professional; USB 1.0 or 2.0; 64MB RAM (minimum) Macintosh - Mac OSX (10.6.4 or higher); USB 1.0 or 2.0; 64MB RAM (minimum)