Digital Cameras have become a common site wherever you go. If you're
getting ready to purchase your first digital camera, or maybe you're
looking to replace one you already have, it is best to familiarize
yourself with the knowledge of what makes one digital camera different
from another and choose the one that is right for you. In this article
we'll cover one of the most significant factors in picture quality. This
is the "digital film."
Just
like with a film camera, the digital camera has a lens which brings
light into focus on a bed of light sensitive material. In the digital
camera, that light sensitive material is a circuit bed called a "CCD."
The CCD plays the same role as film in a film camera and the lens allows
light to fall onto the CCD which is then converted into a digital
image. The quality of the lens can make a significant difference in the
clarity of that image. Very cheap digital cameras may even use a piece
of plastic as the lens, which will usually have an uneven surface and
light transmission. This will be noticeable in the picture but may not
be an issue for a security camera or a web cam. Better quality digital
cameras will have ground-glass lens and high-end digital cameras will
even have interchangeable lenses as do high-end film cameras. The lens
still plays the important role of bringing light clearly to the CCD
surface for a distortion free picture.
A CCD also provides an
interesting advantage to the digital camera. It is possible to
automatically adjust light sensitivity to improve contrast, shoot in dim
light, or even take black and white, sepia or infrared and ultraviolet
light pictures with the touch of a button. Because any of these images
are stored as the same data on the memory card, a digital camera can
offer unsurpassed versatility without the need to change film types. Not
all digital cameras have these features built in, but they are options
you may see in some cameras. While the possibilities are cool, ask
yourself if you that is a feature you need in a digital camera.
With
digital cameras, CCD is a grid of light sensitive points which capture
the image for conversion into a digital image. The number of points on
the CCD is measured in terms of "mega pixels." The mega pixel rating is a
completely new bit of terminology and is unique to the digital camera.
The mega pixel rating is a measure of the resolution of the camera, or
its ability to store details of am image. For example, a digital camera
with a maximum resolution of 1280 by 768 pixels (dots) comes out to a
total of 983,040 pixels with which to describe the digital image. As
each mega pixel represents one million pixels, we can see this isn't
even one mega pixel. Some digital cameras have mega pixel ratings at 5.1
and even 7.1 mega pixels. What does this mean to you? The more pixels
the more detail stored. If the image is going to be viewed on a screen
or a TV, this isn't very meaningful because video displays have
resolutions which are usually well below one mega pixel. However, when
printing on a high quality photo printer, the difference between a 3
mega pixel digital camera and a 5 mega pixel digital camera can be very
obvious.
Some people will try to evaluate a mega pixel rating by
how large a print can be made from the digital camera's image. The truth
is that any digital image can be printed to any size. The real issue is
what it looks like. Most people print their film to 4x6 prints and many
are now doing the same with their digital cameras. Ask to see printed
samples of pictures which are like the type you would normally take and
compare the same prints between different cameras. Many stores will try
to dazzle you with colorful still life images of piles of multi-colored
fruits and hot air balloons. Do you take pictures like that? Probably
not, so perhaps they're not the best images to be scrutinizing. If you
take pictures of friends standing around, use each camera to take
pictures of people standing around. Then use a demonstration printer at
the store to make prints and look at the results. Do you see little dots
in the middle of solid colors? Does the image look like it was taken
with a poor quality film camera? Don't seek out the digital camera that
happens to take perfect pictures in a perfect setting, contrived by the
marketing department of the digital camera's manufacturer. Look for the
digital camera that takes pictures you like in the settings in which you
most commonly find yourself.
Another issue to consider is that
some digital cameras are designed for "point and click" use while other
cameras are designed with lots of settings which must be manipulated for
optimal results. In my personal experience, I have found that Kodak
makes digital cameras which are ideally suited for simple "point and
click" use and consistently take great looking pictures in a wide
variety of settings. I have also personally found that digital cameras
from Nikon work best when you set them to "manual" and do not rely on
the automatic settings. This seems to be true of their film cameras as
well. Does this make one digital camera better than another? Only if one
fits your needs and skills, and the other does not.
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