Depth of field

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Depth of field

  1. 1. Optics and Depth of Field
  2. 2. Your Lens <ul><li>Your lens is made up of curved glass that is moved when you focus and zoom </li></ul>
  3. 3. Focal Length <ul><li>Focal length refers to the strength of magnification by a lens </li></ul>
  4. 4. 24mm 50mm 200mm 800mm
  5. 5. Focal Length and Angle of View <ul><li>The Shorter the Focal Length the wider the angle of view </li></ul>
  6. 7. Other features of focal length <ul><li>Short Focal length = wide angle </li></ul><ul><ul><li>Wide angle lenses tend to distort objects especially if they are close to the lens </li></ul></ul><ul><li>Long focal length tends to compression image </li></ul>
  7. 8. Wide Angle Distortion
  8. 9. Wide Angle Distortion
  9. 10. Long Focal Length/Telephoto Compression
  10. 11. Telephoto Compression
  11. 12. Special Lenses
  12. 13. Tilt Shift Lens
  13. 14. Tilt Shift
  14. 15. Tilt Shift
  15. 16. Fisheye
  16. 17. Fisheye
  17. 18. Depth of Field <ul><li>The portion of a scene that appears sharp in the image </li></ul><ul><li>A lens can precisely focus at only one distance, but the decrease in sharpness is gradual on either side of the focused distance </li></ul><ul><li>Not easily perceived by the human eye </li></ul>
  18. 20. Long/Deep Depth of Field Shallow Depth of Field
  19. 21. Depth of Field is Controlled by Three Things <ul><li>Aperture </li></ul><ul><li>Focal Length-zoom </li></ul><ul><li>Closeness of subject to camera </li></ul>
  20. 22. Controlling Depth of Field with Aperture <ul><li>A low aperture (1.8 to 5.6) gives you low.short/shallow depth of field </li></ul><ul><li>A high aperture (11-32) gives you a long/deep depth of field </li></ul>
  21. 23. F 3.5 F 22
  22. 25. Controlling Depth of Field with Focal Length <ul><li>Longer lenses tend to give you a shorter depth of field resulting in blurrier backgrounds </li></ul><ul><li>Wider lenses are better at keeping more depth in focus </li></ul>
  23. 27. Controlling Depth of Field with Proximity to Subject <ul><li>Similarly, the closer you are to the object the less depth of field will be present </li></ul><ul><li>This is the same idea as focal length </li></ul>

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