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Portraits

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Portraits

  1. 1. Depth of Field & Portraits
  2. 2. Depth of Field <ul><li>What is depth of field? </li></ul><ul><ul><li>Depth of Field is the area that is in focus within the picture </li></ul></ul><ul><ul><li>This includes the area in front of your subject and the area behind your subject that is in focus </li></ul></ul>
  3. 3. <ul><li>What does Depth of Field look like? </li></ul><ul><ul><li>In the following photographs we will see three photographs taken from the identical viewpoint </li></ul></ul><ul><ul><li>See if you can identify the differences between them </li></ul></ul>
  4. 7. What is the difference between these photographs? How do we describe the difference?
  5. 8. How do we control depth of field? <ul><li>Think back to the Project Pinhole what did we do? </li></ul><ul><ul><li>We used three different aperture sizes </li></ul></ul><ul><li>How did the aperture sizes change the overall focus of the image? </li></ul><ul><ul><li>The smaller aperture gave us … </li></ul></ul><ul><li>How do you control the size of the aperture on your camera? </li></ul><ul><ul><li>The aperture ring or button of course </li></ul></ul>
  6. 9. Aperture <ul><li>When we talk about the size of an aperture on a camera how do we talk about it? </li></ul><ul><ul><li>We refer to them as F-stops. </li></ul></ul><ul><li>What is the normal range of F-stops? </li></ul><ul><ul><li>2, 3.5, 4, 5.6, 8, 11, 16, 22 </li></ul></ul><ul><li>Which one is the larger aperture? </li></ul>
  7. 10. Explanation of F-stops <ul><li>Why is a large aperture expressed as a smaller number and a smaller aperture as a large number? </li></ul><ul><ul><li>F-stops are a ratio </li></ul></ul><ul><ul><li>They express the diameter of the aperture compared to the length of the lens’ focal length </li></ul></ul><ul><ul><li>So F2 means that the aperture diameter is ½ the length of the lens </li></ul></ul>
  8. 11. Here is a chart that explains it concisely
  9. 12. How can it affect your portraits <ul><li>http:// www.andylim.com/photo/depthoffield.htm </li></ul>

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