Unit 57 Photography Depth of field The depth

Unit 57 – Photography Depth of field

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 (f 2. 8) = small depth of field

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

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

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

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, f 2 Large depth of field Small depth of field

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

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 90 mm lens is focused on 8 metres. At f: 32, everything between 4 m and infinity will be in focus.

This 35 mm lens is focused on 1. 6 metres. At f: 22, everything between 0. 8 m and infinity will be in focus. What will be in focus at f: 16? What will be in focus at f: 8?

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