Our assignment was to pair up and take 3 pictures of each other. One photo was take with the lowest f/stop number as possible, one in the middle ground, and one with a high f/stop number.
For this picture, I took a shot of Frank with background in clear focus and no blur. The aperture was fairly small at f/10 or f/11 so the shutter stayed open for a lot longer than the other photos that were at f/5 or f/4
This photo of Frank is at an f stop number of f/5 so that background is blurred out somewhat but some details can be seen with the shapes and people in the background while Frank is in focus still.
This photo of Frank is at an f stop number of f/4 where now th background is completely blurred and it is beginning to become hard to make out details in the background.