Aperture Lesson

I. What is aperture?

Aperture: Is the opening and closing of the camera lens

II. What does aperture do?

Aperture Effects 2 areas

1. The amount of LIGHT that the lens lets into the camera

2. The amount of Blur or Sharpness in a photo


Low Aperture

  • Is Called Shallow depth of field
  • Low F/stop number (under f/10)  
  • One area of your photo is super sharp while other parts of the photo remain blurred

Low Aperture is good for

  • Portraits 
  • Isolation of an object
  • Low light situations

Note: The photos below were shot with a low
aperture setting on the camera: f/4 or lower.
They have a swallow depthof field.



  • Is called Deep Focus
  • High f/stop number (over f/12) 
  • Most or all of the photo is in focus.

High Aperture is good for

  • Scenery or landscape
  • Large Group Photographys
  • Documentary/Street Life Photos

Note: The photos below were shot with a Large aperture setting(f/12 or higher). 
They have a Deep Focus


The Camera and Aperture

  • The Aperture is located in the lens and not in the camera.  
  •  To control the Aperture on your camera, turn the top dial to AV to put you in Aperture Mode.
  • You will now be in control of the aperture on your camera.
  • The camera will still control the shutter speed.

Below is what your camera lens looks like as you change your aperture.

Below is where the aperture f/stop number is located on the back of your camera

High Aperture:  

  • Smaller the opening 
  • Less light is gets through
  • Higher f/stop number
  • More in Focus

Low Aperture:  

  • Larger the opening 
  • More Light is gets through
  • Lower f/stop number
  • Less in Focus


_______________________________________3 Things Determines Aperture/Depth of Field?

1. Aperture F/stop setting on your camera

2. Type of lens used –Different lens have different Apertures or F/Stops.  

3. Distance from the Object

These images above were both shot at f/5.6. The can is about two feet in front of the camera, so by keeping the subject relatively close to the camera and by keeping the background elements further away, we can achieve the shallow depth of field look