The tilt effect alters the focal plane of the image, but the shift effect alters an image's perspective. With the Shift knob, you can move the lens up and down ...
Photographers use tilt-shift lenses to achieve depth of field and perspective effects in-camera that you can otherwise only approximate with digital tools.
How To Create A Miniature Tilt-Shift Effect · Step 1: Duplicate The Background Layer · Step 2: Select The Tilt-Shift Filter · Step 3: Adjust The Blur Amount.
In Photoshop, go to Filter > Blur Gallery and select Tilt Shift. This will drop a pin in the image with adjustable lines that approximate where the effect will ...