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Camera Lens

Camera Lens. Nahum D. Solomon Pr. Tim Johnson November 30, 2009 Wentworth Institute of Technology. The camera lens design depends on the property of light to bend. Light is bent when it passes between substances having different densities

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Camera Lens

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  1. Camera Lens Nahum D. Solomon Pr. Tim Johnson November 30, 2009 Wentworth Institute of Technology

  2. The camera lens design depends on theproperty of light to bend • Light is bent when it passes between substances having different densities • The camera lens bends light in a precise manner, redirecting rays to converge at a point

  3. Light rays from a closer point converge farther away from the lens than light beams from a distant point Focal • Lens focal length is defined by the distance between lens and focused image on sensor of a subject at infinity. Focal length is often referred to as “angle of view” by photographers

  4. Focal length of lens describes itsmagnifying power • • On digital cameras, focal length is often expressed as 35mm film camera equivalent • • Higher focal length number indicates a greater image magnification • Telephoto ~100-300mm • Normal ~50mm (human eye) • Wide angle ~18-35mm

  5. A zoom lens allows choice of any focal length within the lens design range • Angle of view / magnification trade-off • Zooming out” uses shorter focal length, providing wide-angle view • “Zooming in” uses longer focal length, narrowing field of view so objects appear large

  6. Zooming in magnifies by cropping the scene tighter than a wide-angle lens • Collection of photos taken from same position with lenses ranging from wide angle to telephoto: 24mm, 35mm, 50mm, 100mm, 200mm, 300mm

  7. Lens optics • A cross-section of a camera lens shows it is constructed of a complex series of multiple lenses • The array of concave and convex lens elements is designed to correct for optical aberrations

  8. Zooming in is great for Portraits • Zooming in allows filling the frame from a distance • Keeping at a distance allows candid shots • Short depth-of-field nicely blurs background

  9. Wide screen Lense • Wide angle lens may introduce perspective distortion Might make pictures appear feather or longer than they really are Allusions

  10. Caution when using • Wide-angle close-ups distort facial features, giving a "fish bowl" effect Can make you look weird or scary

  11. When to use Wide sceen • Use to capture a large area picture • Used in a crowd • Used to capture a wide building/area

  12. Focusing tips • When you buy a camera, BUY THE LENSE THAT MATHCES THE BODY!!!! • The auto focus system adjusts the focus to make the subject in the center of the viewfinder appear critically sharp. • Auto focus may have trouble focusing in certain situations • THEN USE MANUAL ZOOM

  13. Lenses are expensive At times more expensive then the Body of the camera Range from 90$-500 Depending on the zoom length

  14. Bibliography: • Self experience • http://cameras.about.com/od/cameratips/Digital_Camera_and_Photography_Tips_How_Tos_and_Tutorials.htm • http://digital-photography-school.com/how-to-use-a-camera-phone • http://en.wikipedia.org/wiki/Photographic_lens • http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/990/ON-CAMERA-LENS/overview.html • http://www.the-digital-picture.com/Canon-Lenses/ • http://www.cambridgeincolour.com/tutorials/camera-lenses.htm • http://www.ehow.com/how-does_4703550_how-camera-works.html

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