If you use a digital camera, it can help to have a little deeper understanding how these modern wonders work. Briefly, digital cameras have a series of lenses that focus light onto a sensor instead of film. The sensor electronically records the image, and transfers it to the "brains" of the camera. Here it is organized and then converted into binary data, so it can be stored in memory or on removable memory units for later reading by a computer or printer.
Most digital cameras' sensors are charge-coupled devices, or CCDs, although some cameras instead have a complementary metal oxide semiconductor, or CMOS. Either way, light is converted into electrical charges, which are transferred to the brain, and finally onto the storage media.
As part of this process the sensors filter the light into the three primary colors, which can be combined to create the full spectrum. The more expensive (and higher quality) cameras use three separate sensors to accomplish this task. Each sensor is fitted with a filter of a different color, making it read only the light that matches that color.
Digital cameras also control the amount of light that actually reaches the sensor. They do this through the aperture or hole size, and through the shutter speed. Most cameras have automatic aperture setting though some do allow for manual control, which is preferable for professional photographers and advanced amateurs. Shutter speed is set electronically.
There are four kinds of lenses used by digital cameras: optical-zoom lenses with automatic focus; fixed-focus, fixed-zoom lenses; digital-zoom lenses; and replaceable lens systems. Optical zoom lenses have both telephoto and wide options, while the fixed focus and fixed zoom lenses are used in the ordinary, inexpensive cameras that infrequent users own. The digital zoom lens creates the illusion of a zoom effect by culling pixels from the central part of the image and enlarging them to fill the frame. This, however, often results in a grainy or fuzzy image at the extreme limits of the camera's capabilities.
An LCD screen is standard on most digital cameras today, and they help in previewing images and also checking them out after taking a shot. Many screens are rather small, because there is only so much space on a camera for them. It is always best to transfer the images to a computer for viewing. In terms of image quality in general, the higher resolution the camera, the better the image quality.
For printing photos, resolution of the original image is also key. A low quality camera such as those found in many cell phones will create images that are really only useful for emailing or for web pages. A 2-megapixel camera produces images that can be blown up to about 4x6 inches. Four megapixels will create nice 16x20 inch images, but with falling prices on most digital cameras, if you enjoy photography and enlarging photos, don't settle for less than six megapixels.
Early digital cameras stored images on memory resources built into the camera. Images were then transferred to computers with the help of cables. Most modern digital camera makers utilize reusable and removable storage devices. These devices include SmartMedia cards, CompactFlash cards and other memory sticks. Other, less common removable storage devices include hard disks or microdrives, and writeable CDs or DVDs. These options have considerably enhanced the volume of visual data that can be stored as well as the overall flexibility of the modern digital camera.
How Do Digital Cameras Work
The digital camera has two things: a built-in computer, and electronic recorded images. They have not entirely replaced the conventional camera, though, as film represents the highest quality of pictures.
The early digital cameras were used to store images on memory devices within the camera, then transferring the images to the computer with the help of cables. Today, most digital camera makers provide reusable and removable storage devices, such as SmartMedia cards, CompactFlash, cards and Memory Sticks. Some other removable storage devices include the floppy disks, hard disks, or micro-drives, writeable CDs and DVDs. This has considerably enhanced the volume of visual data that can be stored.
A digital camera uses light converted into electrical charges, instead of film, to take pictures. It focuses this light through a lens or a series of lenses onto a sensor, which records the image electronically. The sensor used the most is employed by a CCD (charge coupled device) while others use a CMOS (complementary metal oxide semiconductor).
If a CCD is used to transport the charge, its sensors create a high-quality, low-noise image, while the CMOS are more susceptible to noise while traditionally using less power. The CCDs consume as much as 100 times more power than that of a CMOS yet have been mass-produced for a longer time. They have a higher number of higher quality pixels yet both play the same role - they turn light into electricity.
What every photographer is looking for is clarity and high detail, with very little blurriness or a grainy look. This has to do with the resolution of the camera, which refers to the amount of detail the camera can capture. Hewlett Packard estimates that a 35mm film is about 20 million pixels, considered a very high-resolution picture - 1216 x 912, or 2 million total pixels, is a photo lab quality for the 4 x 5 picture.
To break it down even more, a 1 megapixel digital camera will produce images that are good for e-mailing or posting on the Web because their resolution is low. The images taken from a 2-megapixel camera are suitable for 4x5 inch prints while those taken from a 4-megapixel camera can produce 16x20 inch prints.
The digital cameras use four kinds of lenses. These are: fixed-focus, fixed-zoom lenses; optical-zoom lenses with automatic focus; digital-zoom lenses, and replaceable lens systems. The fixed focus and fixed zoom lenses are used in inexpensive cameras while the optical zoom lenses have both wide and telephoto options. The aperture and shutter speed are used to control the amount of light that reaches the sensor.
The aperture setting, or the size of the opening in the camera, is automatic in most digital cameras but a few allow manual adjustment. This is because certain professionals or amateurs want more control over the final image. The shutter speed is the time amount that passes through the aperture. This can be set electronically, which is different than using film in the conventional 35mm cameras. The digital camera has a digital shutter, rather than a mechanical shutter.
Overall, the digital camera and the traditional film camera have the same principals. The both have a viewfinder for aiming the camera, the lens for focusing, the ability to store several images and remove them later on, with a compact format for everything's storage.
Two different systems yet slightly the same - the conventional camera captured images with light-sensitive film to store them after chemical development, while the digital camera used memory storage and advanced image sensor technology, capturing images to store them in digital format that is instantly available instead of having to wait. Yet the digital camera is more environmentally friendly, keeping up with the issues of the world while photographing these issues at the moment they occur.
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