Use any scene you want to do this demo. Look for detailed objects or one object that gradually increases in distance from you. Use a scene you find or setup your own. Be creative and push it beyond just a technical exercise!! You will probably need a tripod or stable object to place your camera on. DO NOT MOVE YOUR CAMERA while doing this. If you have to then mark the location of your camera with chalk before you move it. Start at your lowest aperture and move to the highest, adjusting the shutter speed each time so that you have the same exposure level.
Save on your memory stick as in a folder labeled: dof demo
Save images as jpeg "f18.your name" , "f16.your name" etc.
Bring to next class. We are going to make a contact sheet out of them.