In our second lesson, we looked at Depth of Field and the use of Aperture Priority mode on our cameras.

Depth of field determines how much sharpness there is in the picture. The sharpest part is always the place on which you focus your camera.

We learned that

  • the lower the f number (f stop), the more blurry the background behind the subject will be. The subject will stand out from the background. A lower f stop is good for portrait photography when you want to focus on the subject. When using a low f stop, more light can enter the camera. This is called a small or shallow depth of field.
    The more you zoom in on your subject, the more blur there will be in the background.
  • the higher the f stop, the less blur you get as the depth of field is extended and the subject will blend in with the background. More of your photo will be in focus and a longer exposure  time will be required and you will therefore need to use a tripod. A higher f stop is better for landscape photography and it is also means that less light can enter the camera.

Note that you can’t see the effects of aperture changes until you view the photos.

Our task this week was to take photos of three objects standing together and to use different f stops to demonstrate how the photo starts to blur as you use lower numbers.

The first set of photos were taken at a focal length of 40mm

 Aperture (f/stop)  Shutter Speed  ISO
 f/4.5  1/125 sec  100
 f/8  1/80 sec  160
 f/11  1/80 sec  320
 f/18  1/80 sec  800
f/29  1/80 sec  2000

 I was curious to see what would happen if I zoomed in further.

The following photos were taken at a focal length of 100mm.

 Aperture (f/stop)   Shutter Speed  ISO
 f/5.6  1/160 sec  ISO-320
 f/8  1/160 sec  ISO-640
 f/11  1/160 sec  ISO-1250
 f/18  1/160 sec  ISO-3200
 f/22  1/100 sec  ISO-3200
 f/29  1/60 sec  ISO-3200
 f/32  1/50 sec  ISO-3200



Units covered in this blog:

Unit 01: 2.2, 2.3, 2.4, 2.5, 2.6, 2.8, 2.10