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

2.  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.  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.  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.  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.  Collection of photos taken from same position with lenses ranging from wide angle to telephoto: 24mm, 35mm, 50mm, 100mm, 200mm, 300mm

7.  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 allows filling the frame from a distance  Keeping at a distance allows candid shots  Short depth-of-field nicely blurs background

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

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

11.  Use to capture a large area picture › Used in a crowd › Used to capture a wide building/area

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

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