1. Unit 57 – Photography Depth of field

2. The depth of field is a measure of how much of the scene is in sharp focus
Small aperture (f:22) = large depth of field
Large aperture (f2.8) = small depth of field

3. Depth of field depends on…
The focal length of the lens
How close the object is to the camera
The aperture, or f:stop, being used

4. Telephoto lenses have a smaller depth of field than wide-angle lenses
200 mm
Lens at f:2.8
28 mm
lens at f:2.8

5. The depth of field gets smaller when the subject is close to the camera.

6. Smaller apertures (bigger f:numbers) have a greater depth of field than larger apertures (smaller f:numbers)
f:16, f:11, f:8, f:5.6, f:4, f:2.8, f2
Large depth of field
Small depth of field

7. Smaller apertures (bigger f:numbers) have a greater depth of field than larger apertures (smaller f:numbers)
50mm lens on f:2
50mm lens on f:16

8. Some lenses are marked with a depth of field scale
What will be in focus at f:16?
What will be in focus at f:8?
This 90mm lens is focused on 8 metres. At f:32, everything between 4m and infinity will be in focus.

9. This 35mm lens is focused on 1.6 metres. At f:22, everything between 0.8m and infinity will be in focus.
What will be in focus at f:16?
What will be in focus at f:8?

10. 35mm wide-angle lens 90mm telephoto lens
What will be in focus at f:22 for each lens?