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					Digital Photography
       Digital Photography

Q. What makes a digital camera different from a conventional cam

A. Digital cameras do not take “real” pictures and they do not requ
   the use of conventional film and paper.
         Parts of A Camera

•Lens: used to focus the image onto the back of a camera.
•Shutter: used to determine whether or not light can get in to the
•Diaphragm: used to determine how much light gets in to the cam
•CCD: used to convert light to electrical signals.
•Storage: what the camera uses to save the visual light image th
    Digital Vs. Conventional

Uses small servo motors for           Uses small gears for manual
power zoom. Function is still         zoom. Function is still to focus
to focus the light on to the CCD.     the light on to the film at the
Size is relatively small & compact.   back of the camera. Can range
                                      size from small to very large.
     Digital Vs. Conventional
Digital cameras do not have any Conventional cameras use a
type of shutter. Instead the term mechanical shutter to keep light
shutter refers to how fast or slow out when you don’t want to
the CCD sends an electrical signalexpose the film and to let light in
to the media storage device. The when you do want to expose the
faster it sends the electrical signal film. They come in to styles:
the faster we say the “shutter        either between the lens or in the
speed” is. The slower the signal iscamera.
sent the slower the “shutter speed”.
     Digital Vs. Conventional
Digital cameras also have either a
fixed or variable diaphragm. Most Conventional cameras either hav
though have fixed diaphragms duefixed or variable diaphragms.
to cost. Just like with the lens, a Most cameras have the fixed typ
manual diaphragm uses very small diaphragms. These are easy
servos to adjust the opening in thedetermine. You can not change
lens. For the most part if the      the opening in the lens. Variable
digital camera is under $200 to     diaphragms are more expensive
$300 dollars it will have a fixed   but allow you more control over
diaphragm. Those that do have your exposure.
variable diaphragms will give you
more control over exposure.
     Digital Vs. Conventional
                   Image Conversion

                                      Conventional cameras do not hav
                                      to convert the image coming into
                                      the camera. This is due to the fa
Digital cameras need to convert the
                                      that they are using a storage med
visual light image that is coming in
                                      that uses visual light images.
through the lens in to something
that it can use. The CCD is the tool
that converts visual light images in
to digital electrical signals that can
be stored on modern digital media
storage devices.
        Digital Photography

Q. If digital cameras do not take “real” pictures, what type do they t

A. Digital cameras create a “digital” representation of the “real” ima
   that you are taking a picture of.
How Cameras Take Picture

       Conventional Photography

         Digital Photography

       Digital Photography

Q. If digital cameras do not use conventional film and paper, what
   they use to save and print the picture to?

A. Digital cameras save the images to several different types of m
   storage devices. The pictures that you print are also printed on
   special paper designed for digital pictures.
   Digital Vs. Conventional
                    Storage Media
                              Conventional cameras have a ve
                              simple, yet very ancient method
                              of storing the images that you
                              capture with your camera--FILM.
           Digital cameras
                              Film is a substrate made of silver
use many different types of
                              halide crystals that are extremely
                              sensitive to light. Areas of the film
storage devices. Some of
                              that are exposed to light turn dark
the most common types are
                              Areas that are not exposed to ligh
shown above. They include
                              stay unexposed and are washed
from left to right: compact
                              away during the developing
flash, smartmedia, compact
flash II, PCM II card, and
  Digital Camera Family Tree
Generation 1 Digital Cameras
•very costly                                                      Generation 4 Digital Cameras
•few features                                                     •even higher resolution/ & eve
•low resolution                                                    cheaper cost
(less than 1 megapixel)                                           •higher quality cameras cost
•fairly big in size                                                 less
                                                                  •higher resolution means more
Generation 2 Digital                                                storage capacity needed
Cameras                                                           •future generations will build
•more competition = lower                                           off of what was gained in this
prices                                                              generation
•more features
•medium resolution (1 -
1.3 megapixels)
•sizes started shrinking
        Generation 3 Digital                     •low prices & better •Cameras are now the
        Cameras              •a lot of features  technology make same size or smaller
                                                 higher resolution
        •costs comparable to including more manual                    than conventional
        conventional camerascontrol              cameras cheaper to Cameras.
                                                 make and to buy
Future of Digital Photography

•HD digital cameras capable of shooting HD
•HC *(High Content/ Capacity) cards can
save & store larger files. requires the use of
card readers that read HC cards.
•Built-in projectors.

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