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Lenses

Lenses. Are classified by their Focal Length. Focal Length. The distance from the optical center of a lens to the front surface of the imaging device. Short Focal Length. Wide Angle View. Short Focal Length. EXAMPLE Entire Football Team. Long Focal Length. Narrow Angle View.

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Lenses

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  1. Lenses • Are classified by their Focal Length

  2. Focal Length • The distance from the optical center of a lens to the front surface of the imaging device.

  3. Short Focal Length • Wide Angle View

  4. Short Focal Length EXAMPLE • Entire Football Team

  5. Long Focal Length • Narrow Angle View

  6. Long Focal Length EXAMPLE • One Football Player

  7. Zoom Lens • Variable Focal Length

  8. Zoom Range • How close to how far a lens can see

  9. Lens Speed • How much light can pass through a lens

  10. Fast Lens • Lets a great amount of light pass through

  11. Fast Lens • Use in the evening, when there isn’t much light. • For low light settings

  12. Slow Lens • Lets a small amount of light pass through

  13. Slow Lens • Use this on bright, sunny days • For bright light settings

  14. Iris • Adjustable lens opening mechanism http://en.wikipedia.org/wikiFile:Iris_Diaphragm.gif

  15. Aperture • Hole in center of iris • Measured by f-stops

  16. Aperture • Similar to the pupil of your eye

  17. Aperture • Can adjust larger or smaller depending on the amount of light

  18. Aperture • What type of aperture opening would you use for a sunny day?

  19. Aperture • What type of aperture opening would you use for a dark room with only a candle for light?

  20. Auto Iris • Many cameras have auto iris • Adjusts automatically depending on setting

  21. Focus • When subject in viewfinder is sharp and clear.

  22. Vincent LaForet on Lenses • https://www.youtube.com/watch?v=ZCWn4QTst64&list=PL8E0B0472A88A3A04

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