Understanding aperture and depth of field

1. Depth of field is the zone of sharp focus in a picture. 

2. An aperture is simply an opening

in the front of your lens controlled by blades.

3. The aperture f/1.8 is a very big aperture and it creates a very shallow depth of field.

4. Stop down means to close the aperture down.

5. To make everyone sharp, you would close the aperture down, or stop down to f/22. 

6. The shutter speed slows way down as you stop down the aperture, in other words, the slower the aperture the slower the shutter speed.

7. The mode is the f/number sign in your view finder. This shows that you have the aperture turned on. 

8. A fast lense is a lense with a very big aperture opening. 

9. The aperture is controlled by blades in your lens.