Slide 1

Report
Nahum D. Solomon
Pr. Tim Johnson
November 30, 2009
Wentworth Institute of Technology

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

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
• 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

Angle of view /
magnification trade-off

Zooming out” uses shorter
focal length, providing wideangle view

“Zooming in” uses longer
focal length, narrowing field
of view so objects appear
large

Collection of photos taken from same
position with lenses ranging from wide
angle to telephoto: 24mm, 35mm,
50mm, 100mm, 200mm, 300mm

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

Zooming in allows filling
the frame from a
distance

Keeping at a distance
allows candid shots

Short depth-of-field
nicely blurs background

Wide angle lens may introduce
perspective distortion
Might make pictures
appear feather or longer
than they really are
Allusions

Wide-angle close-ups distort facial
features, giving a "fish bowl" effect
Can make you look weird
or scary

Use to capture a large area picture
› Used in a crowd
› Used to capture a wide building/area

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
At times more expensive then the
Body of the camera
Range from 90$-500
Depending on the zoom length

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
Self experience
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-usea-camera-phone
http://en.wikipedia.org/wiki/Photographic_lens
http://www.cs.mtu.edu/~shene/DigiCam/UserGuide/990/ON-CAMERA-LENS/overview.html
http://www.the-digital-picture.com/Canon-Lenses/
http://www.cambridgeincolour.com/tutorials/camer
a-lenses.htm
http://www.ehow.com/how-does_4703550_howcamera-works.html

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