VALUE OF OPENING
Depth of Field (DOF)
MC310: Basic Photography Class
Mass Communication Program
Ateneo de Davao University
DOF Defined
§  The distance in front of and beyond the
subject that appears to be in focus.
DOF Control: f number
§  the f-number (sometimes
called focal ratio, f-ratio)
of an optical system
expresses the diameter...
Narrow DOF
Circle of Confusion
Circle of Confusion
§  The points in
focus (2)
project points
onto the image
plane (5), but
points at
different
distances (1
and 3) project
b...
§  Decreasing the
aperture size
(4) reduces the
size of the blur
circles for
points not in
the focused
plane, so that
the...
Sample: 35mm lens
§  A 35 mm lens set to f/11.
The depth-of-field scale
(top) indicates that a
subject which is anywhere
...
Various Aperture Value
f/22

f/8

f/4

f/2.8
F 3.2
F 3.6
F 4.0
F 4.5
F5.0
F 5.6

F 6.4

F 7.1

F 8.0

F 9.0
Compare f3.2 and f9.0
Effect of DOF
§  At f/32, the
background is
distracting.
§  At f/5.6, the flowers
are isolated from the
background.
At f/2.8, the cat is isolated from the background.
Hyperfocal Distance
Session 4 Depth of Field (DOF) and Aperture (Photography Class)
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Session 4 Depth of Field (DOF) and Aperture (Photography Class)

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Class Lecture on Depth of Field (Basic Photography), Aperture

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Session 4 Depth of Field (DOF) and Aperture (Photography Class)

  1. 1. VALUE OF OPENING Depth of Field (DOF) MC310: Basic Photography Class Mass Communication Program Ateneo de Davao University
  2. 2. DOF Defined §  The distance in front of and beyond the subject that appears to be in focus.
  3. 3. DOF Control: f number §  the f-number (sometimes called focal ratio, f-ratio) of an optical system expresses the diameter of the entrance pupil in terms of the effective focal length of the lens. §  Quantitative measure of lens speed.
  4. 4. Narrow DOF
  5. 5. Circle of Confusion
  6. 6. Circle of Confusion
  7. 7. §  The points in focus (2) project points onto the image plane (5), but points at different distances (1 and 3) project blurred images, or circles of confusion.
  8. 8. §  Decreasing the aperture size (4) reduces the size of the blur circles for points not in the focused plane, so that the blurring is imperceptible, and all points are within the DOF.
  9. 9. Sample: 35mm lens §  A 35 mm lens set to f/11. The depth-of-field scale (top) indicates that a subject which is anywhere between 1 and 2 meters in front of the camera will be rendered acceptably sharp. §  If the aperture were set to f/22 instead, everything from 0.7 meters to infinity would appear to be in focus.
  10. 10. Various Aperture Value f/22 f/8 f/4 f/2.8
  11. 11. F 3.2
  12. 12. F 3.6
  13. 13. F 4.0
  14. 14. F 4.5
  15. 15. F5.0
  16. 16. F 5.6 F 6.4 F 7.1 F 8.0 F 9.0
  17. 17. Compare f3.2 and f9.0
  18. 18. Effect of DOF §  At f/32, the background is distracting. §  At f/5.6, the flowers are isolated from the background.
  19. 19. At f/2.8, the cat is isolated from the background.
  20. 20. Hyperfocal Distance
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