Understanding Apertures and Depth of Field

1. Depth of field is simply the zone of sharp focus. 

2. Apature is how big the opening of your camera lense is. 

3. An apature of f/1.8 will create the shallowest depth of field for this image. An apature of f/22 will make the whole image in focus. 

4. Stop down means to close the apature to f/22 which will make everything in the picture sharp. 

5. To make all three people sharp you must set your camera to an apature of f/22. 

6. As you stop down your shutter speed get slower. 

7. To control your apature you set your camera to Av or apature priority. 

8. A fast lens is a lens with a maximum apature opening. 

9. The apature is an opening controlled by an auto single lense focus.