Tilt shift lens are a style of lens that mimic the large format bellows capabilities. Mainly used for architecture these lens can tilt and sway, by doing this you can control what is in focus more.if you would like to see other videos like this go to youtube or digital camera reviews,also if you want to find were to buy a lens like this, you can find them at B&H photo. Here is another link just for tilt shift photography.
Cooper Ricketts Photography Blog 