The camera is often an obtrusive presence when you’re trying to take a picture in front of a mirror. Here’s how one particular lens manages to pull off the feat of taking the picture "invisibly." The video goes on to give a very good demonstration of how tilt shift lenses work and why you’d use them in different scenarios.
See The Simple Trick That Allows This Lens To Take Pictures Of A Mirror ‘Invisibly’ – Digg
The camera is often an obtrusive presence when you’re trying to take a picture in front of a mirror. Here’s how one particular lens manages to pull off the feat of taking the picture