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Exposure

In Three Parts. Exposure. Know What exposure is What affects exposure Show Define Exposure Identify an over, under, and perfectly exposed photo Use exposure compensation to purposely over and under expose an image Level of Thinking Understand/Apply. Objective. But first….

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Exposure

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  1. In Three Parts Exposure

  2. Know • What exposure is • What affects exposure • Show • Define Exposure • Identify an over, under, and perfectly exposed photo • Use exposure compensation to purposely over and under expose an image • Level of Thinking • Understand/Apply Objective

  3. But first… A Quick Review

  4. What does this stand for?

  5. What does this stand for?

  6. What does this stand for?

  7. What does this stand for?

  8. Which of the PSAM modes would you use if motion was most important in your picture? Question 1

  9. Name the six examples of “Scene” modes. Question 2

  10. What are the two exposure modes used for simple, point and shoot photography? Question 3

  11. Which of the P, S, A, M modes would you use if Depth of Field (DoF) in your photograph is most important? Question 4

  12. Which of the P, S, A, M modes would you use if you want full control over all the settings? Question 5

  13. Exposure

  14. The important components of any camera are: • Box (light-tight)

  15. The important components of any camera are: • Box (light-tight) • Hole or Lens (to let the light in)

  16. The important components of any camera are: • Box (light-tight) • Hole or Lens (to let light in) • Shutter (to open and close to let light in at the right time)

  17. The important components of any camera are: • Box (light-tight) • Hole or Lens (to let light in) • Shutter (to open and close to let light in at the right time) • Film / Sensor (records the light)

  18. Three things affect how much light comes into the camera: • Aperture (opening that lets the light in) • Shutter (how long the light comes in for) • ISO (how much light is needed to make the picture) • Your camera uses a light meter to measure the light coming in, and sets the aperture, shutter, and ISO so the image will be properly exposed. Measuring Light

  19. Get just the right amount of light, and the image is “properly exposed.”

  20. Too much light, and the image will be OVEREXPOSED

  21. Not enough light and the image will be UNDEREXPOSED

  22. Exposure = Total amount of light which hits the film Film and sensors require the right amount of light to produce a ‘correct’ exposure. The settings will be different depending on what you are taking a picture of.

  23. Controlling Exposure Try it Out

  24. You can purposely under or over expose a picture on your camera using Exposure Compensation. • Use the exposure compensation controls on the compact cameras to take the same picture five times: • -2 stops • -1 stop • “properly exposed” (according to camera) • +1 stop (over exposed) • +2 stops • Repeat this for FIVE different setups Try it Out

  25. The Three Parts of Exposure

  26. Three settings need to be considered when taking a photo: • ISO • Aperture • Shutter Speed • All three affect the amount of light that reaches the sensor, and how much is needed to get a proper exposure Three Parts

  27. “International Standards Organization” • Controls how sensitive the sensor is to light • The more sensitive it is, the less light it needs to take the picture • CATCH: A high ISO causes grain in film photography, now it causes NOISE in digital photography ISO

  28. Size of the opening in the lens • How MUCH light comes in at once Aperture

  29. Do big holes (apertures) let in more or less light ? Aperture

  30. F22 f16 f11 f8 f5.6 f4 f2.8 What do you notice about the f number as the aperture gets bigger? Aperture

  31. Each aperture is twice as big (or half the size) as the aperture next to it. QUESTION:an f8 aperture lets in twice as much light as f___ and half as much light as f ___

  32. Aperture affects the DoF in an image • The bigger the aperture, the shorter the depth of field • Think about the aperture setting as being how much of the image is in focus • For instance: f/4, 4 feet in focus versus f/32, 32 feet in focus. Bigger number, more in focus. Depth of Field (DoF)

  33. How long (or short) the shutter is open • How LONG the light comes in for Shutter Speed

  34. Changeshow long the camera lets light hit the sensor A whole number of seconds … 1 second … 2 seconds … 3seconds Or a fraction of a second ½ second … ¼ second …. 1/8 …. 1/15 etc Shutter Speed

  35. Shutter speeds are usually given as a fraction of a second and each shutter speed on a camera is normally about twice as long, or half as longas the next shutter speed. Work out the missing shutter speeds in this list: ½ ¼ ___ 1/15 1/30 ___ 1/125 ___ ___ ___

  36. The shutter speed controls how motion looks in a picture. • The longer the shutter speed, the more blurred the motion will be. SS & Motion

  37. The ISO, Aperture, and Shutter Speed work together to create a properly exposed image that looks the way you want it to. Altogether

  38. How do you know? Light Meter

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