Digital
cameras
The most important part of a digital camera is the lens because light
travels through the lens. Remember this when choosing a digital camera.
It is a good idea to bear in mind the reputation the camera maker
has for producing quality lens.
Think
about the method the camera uses for storing image data. If the
output devices printers and projectors use the card as storage device,
so images stored can be output straight away in these devices.
What are mega pixels?
Unlike
traditional cameras which store images on film, digital cameras
use a small sensor chip - either CCD (Charged Coupled Device) or
CMOS (Complementary Metal Oxide Semiconductor). - The image is stored
in a digital format.
The
surface of the CCD or CMOS is divided into tiny squares known as
pixels. Each pixel records one part of an image. The greater the
number of pixels that can be recorded, the greater the detail that
can be captured. A megapixel is a million pixels. The number of
pixels a digital camera has is a good measure of the details the
digital camera can contain. Picture quality is also effected by
other factors such as the lens, the colour filter used on the sensor
and the digital image processor.
To
understand the concept of digital photography it may help to consider
the way in which humans see images. The process of creating a digital
photograph involves light going through the lens of the camera,
in the same way that light travels through the lens in a human eye.
This light is collected as electrical charges by a sensor like the
retina of a human eye. The image processor of the camerais like
the brain, it processes the image data before storing the image
onto a memory card. The camera has to carry out all these stages
well to ensure good results in terms of image quality.
What
about memory cards?
The
images that are captured with a digital camera are stored on a memory
card. Larger capacity cards enables more images to be stored. For
example a 512MB card will store over 100 high quality images.
Zoom,
zoom, zoom!
Many
digital cameras have zoom lens. These are described as optical zooms
or digital zooms. Optical zooms give a true idea of what a camera
is capable of, where as digital zooms simply enlarge the central
part of an image to give the illusion that the photographer has
zoomed in. The image quality goes down and the pixels that make
up the image are easier to see.
Power
Digital
cameras use a fair amount of battery power to deliver all their
advanced features, so it is important to make sure that the choose
a model with a rechargeable battery system.
Overall
when choosing a digital camera remember megapixels aren't everything.
Consider the lens and CCD as well!
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