Our assignment for the first week was to learn about aperture (http://is.twopeasinabucket.com/photocourse/weekone.pdf). Basically I took a picture of this flower clip I had on a tree and set my aperature 3 different ways. The size of the aperture, or f/stop, of a lens determines how much of your photograph is in focus. The smaller the f/stop, the less that is in focus. You'll see in the first picture it had a low f-stop and the background is really blurry. In the next picture, the background is more in focus and in the last picture I kept the whole thing in focus.
Pic 1- f/4.5
Pic 2- f/10
Pic 3- f/24