Explosure: The exposure setting in
a camera is what regulates how much light is used to create the image. It doesn't matter
whether it is a film camera or a digital camera. The exposure can be controlled in two
ways; aperture adjustment and shutter speed adjustment.
When you press the shutter release button of a digital camera, a metering cell measures
the light coming through the lens and sets the aperture and shutter speed for the correct
exposure. When the shutter opens briefly, each pixel on the image sensor records the
brightness of the light that falls on it by accumulating an electrical charge. The more
light that hits a pixel, the higher the charge it records. Pixels capturing light from
highlights in the scene will have high charges. Those capturing light from shadows will
have low charges.
When the shutter closes to end the exposure, the charge from each pixel is measured and
converted into a digital number. The series of numbers can then be used to reconstruct the
image by setting the color and brightness of matching pixels on the screen or printed
page.
Exposure Versatility: One notable disadvantage of digital cameras is their
inability to handle radically different lighting conditions just by using a different type
of film. With a digital camera, the camera is the film, so whatever you buy is what you'll
have to live with. This means you'll want to be sure your camera's exposure system
(shutter, variable lens opening, supplementary flash) can handle a wide enough range
of conditions.
|
Sony_Digital_Cameras
Kodak_Digital_Cameras
Canon_Digital_Cameras
Olympus_Digital_Cameras
Fuji_Digital_Cameras
Nikon_Digital_Cameras
About
Contact Us
Links
|
