Photography

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Photography

• Newman Lau
• Applied Media Technology Center
• Hong Kong University of Science and Technology
• eegino_at_ust.hk, 2358-8540

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Photography

• Photography is important for images - if you
  dont take a good picture, you cant do anything
  with it.
• Photography is about tradeoffs for light.
• Shutter Speed, Film Speed, Aperture

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Camera Elements
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Shutter Speed

• Controls amount of time film is exposed to
  subject
• Faster shutter speed - less light
• Slower shutter speed - motion causes blur

5
Film Speed

• ASA 25 -gt 3200
• ASA 25 - slow film, high quality, but requires
  more light
• ASA 3200 - fast film, requires less light, but
  grainy

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Aperture

• Size of exposure opening to film
• Larger F-stop smaller opening longer depth of
  field
• Smaller F-stop larger opening shorter depth
  of field

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Lens

• Lens size dictates the field of view
• Wide angle
• Fishbowl
• Telephoto
• Autofocus

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Photography - controlling light

• Tradeoff between aperture and shutter speed
  (shutter speed and aperture markings are related)
• Camera light meter

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Digital Photography

• Image collected by CCD vs. film
• Less dynamic range
• Less resolution
• Compression artifacts
• Convenient
• Shoot and view

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Three Point Lighting
Key light (main light source)
Fill Light
Camera
Object
Back Light (highlights)
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Homework

• Reading online
• Experiment with the Javacam.