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Digital Camera Computer Technology 3200 By: Brittany O’Brien A Filmless Camera Instead of film, a digital camera uses a sensor that converts light into electrical charges.

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Digital Camera

Computer Technology 3200

By: Brittany O’Brien

a filmless camera
A Filmless Camera
  • Instead of film, a digital camera uses a sensor that converts light into electrical charges.
  • There are two different sensors used in different cameras, a charged couple device (CCD) or a complementary metal oxide semiconductor (CMOS).



  • This image sensor transports the charge and reads it at one corner of the array.
  • Creates high-quality low-noise images
  • Consumes 100 times more power then CMOS sensors.
  • Higher quality pixels.
  • Uses several transistors at each pixel to amplify and move the charge using more traditional wires
  • Signal is digital
  • More susceptible to noise
  • Consumes little power
  • Light sensitivity is lower

Resolution is the amount of detail a camera

can capture when a picture is taken.

The more pixels the camera has, the more

detail it can capture and the larger the picture

can be without becoming blurry.

Some typical resolutions are:
  • 256x256 - Found in very cheap cameras, 65000 total pixels
  • 640x480 – Low end on most “real” cameras
  • 1216x912 – “Megapixel” image size, 1 109 000 total pixels
  • 1600x1200 – High resolution, 2 million total pixels
  • 2240x1680 – 4 megapixel camera, the current standard
  • 4064x2704 – Found in a top of the line camera, 11. 1 megapixels.

A digital camera has to control the amount of

light that reaches the center.

Two components a digital camera uses to do

this is the aperture and shutter speed.

Aperture: The size of the opening in the

camera. It is automatic is most digital

cameras. However, it can be adjusted for more

control over the final image.

Shutter Speed: The amount of time that light

can pass through the aperture. The light sensor resets

automatically so the digital camera has a digital



In addition to controlling the amount of light,

the camera has to adjust the lenses to control

how the light is focused on the sensor. Most

digital cameras do this automatically.


Digital cameras one of four types of lenses:

Fixed-focus, fixed zoom lenses: This type of

lens comes on a disposable camera. They are

very limited, but inexpensive and great for


Optical-zoom lenses with automatic focus: This lens has

“wide” and “telephoto” options and automatic focus. These

lenses are very similar to a lens you would find on a video


Digital zoom lenses: With this lens the cameras takes pixels

from the center of the image sensor and averages the pixels to

make a full-size image.

Replaceable lens systems: Similar to a 35mm camera, some

digital cameras can also use 35mm lenses.

storing digital photos
Storing digital photos

Many of today’s camera have

fixed or removable flash


These flash memory devices

Include SmartMedia cards,

CompactFlash cards, and

Memory sticks.