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Week 7 Quiz

Week 7 Quiz. 1. You’re in a dark room taking pictures with flash. When you change your aperture and ISO sensitivity, the exposure changes. However, no matter what you set your shutter speed to, the exposure stays the same. Why?

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Week 7 Quiz

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  1. Week 7 Quiz 1. You’re in a dark room taking pictures with flash. When you change your aperture and ISO sensitivity, the exposure changes. However, no matter what you set your shutter speed to, the exposure stays the same. Why? 2. Most cameras have direct flash – name two reasons why direct flash is bad. Typical direct flash picture

  2. Typical direct flash picture

  3. Lenses

  4. Lenses • Lenses define 2 important things: • Angle of view (focal length) • Aperture

  5. Angle of view Camera sees a “cone” of vision, measured by the angle of the cone Narrow angles of view see very little, but the subject is big Wide angles of view see a lot, but the subject is small Wide angle Narrow angle

  6. Translating focal length into angle of view For 35mm film sensor (diagonal: ~43mm) For 1.5x APS-C sensor (diagonal: ~29mm)

  7. Translating focal length into angle of view Lenses are always specified by focal length Photographers are concerned with angle of view (Depends on focal length and sensor size) Is 90mm a narrow angle lens, or a wide-angle lens? Problem: We want to talk in angles of view, but are given focal lengths Solution: We convert focal lengths to “35mm equivalent”

  8. Translating focal length into angle of view 35mm equivalent focal length Actual focal length

  9. Translating focal length into angle of view 35mm equivalent focal length Actual focal length

  10. Translating focal length into angle of view 35mm equivalent focal length Actual focal length To get the “35mm equivalent” focal length, multiply your actual focal length by the camera’s crop factor When we talk about focal lengths, we’ll assume they are “35mm equivalent”

  11. Focal length ranges Two types of lenses: Zooms (variable focal length) and Primes (fixed focal length) Different focal lengths are useful for different things • Standard range • Covers most commonly used focal lengths, 28mm/wider, 70mm/longer • Good general purpose lens • Standard 18-55 “kit” lens is a standard range zoom 38mm

  12. Focal length ranges Two types of lenses: Zooms (variable focal length) and Primes (fixed focal length) Different focal lengths are useful for different things • Telephoto • Gives a very narrow angle, 70mm and beyond • Large magnification for faraway subjects • Useful for sports, wildlife 320mm

  13. Focal length ranges Two types of lenses: Zooms (variable focal length) and Primes (fixed focal length) Different focal lengths are useful for different things • Ultrawide • Gives a very wide angle, 24mm or wider • Can cover extremely large objects in confined spaces • Useful for landscapes, architecture 19mm

  14. Tools for the job What focal length would you use for a huge building? What focal length for shooting sports from the sidelines? Covering a protest? Taking a portrait? 24mm 110mm

  15. Tools for the job What focal length would you use for a huge building? What focal length for shooting sports from the sidelines? Covering a protest? Taking a portrait? 70mm 310mm

  16. Tools for the job 24mm 39mm Angle of view goes hand-in-hand with subject distance Subject distance defines perspective. Perspective affects: -Distortion -Context 70mm

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