Buy A Digital Camera

Before buying a digital camera, consider for what purpose you will use it. If you need to illustrate your page on the Internet, it will be enough the camera with low resolution. But if you’re going to make prints from obtained images, to receive high-quality photos, you will need a camera with high resolution. Four main factors have a crucial impact on your digital camera:

- Resolution
- Method of operation of CCD
- An optical device of the camera
- Software that “works” with the image.

Resolution is determined by the number of light-sensitive diodes on the surface of the CCD. For instance, if the instruction says that it has a resolution of 1600X1200 pixels, this means that the CCD has about 2 million diodes on its surface. Each of three varied diodes on the surface of the matrix can write data about one of the principle colors. In order to receive data about the color of every pixel, it is necessary to know information about the illumination of at least three diodes. This reduces the actual number of pixels to three times. Instead it the software is used which gives you an opportunity to put an equal sign between the number of pixels and the number of diodes.

Although the statement “the more pixels, the higher the resolution, the better the image” in the main is true, however, other factors have a significant impact on the quality of the “picture”. So it is very important the quality of the production of the CCDs. The more qualitative made the matrix, the less it will have broken diodes (the size of one diode is about 7.5 microns), which will directly affect the quality of photos.

Unfortunately, the quality of the CCD cannot be described by any numbers or categories, therefore only a careful comparison of diverse models guarantees acquiring the best camera. Concentrate on the field, clarity of the visible picture. If you are satisfied with the quality of the picture, then test the camera under various lighting conditions. Ask also, if possible, to print the captured picture; it will give you more information about the CCD.

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You cannot compare the digital photo with the analog one (that applies slides or negatives). From a technological perspective it is rather closer to the video filming that gets an image at any one time

Let’s consider how the analog camera operates.

To put it simply, the analog camera consists of the system of lens, aperture and shutter; the light, having focused in the objective lens, passing through the aperture at a time until the shutter is open, falls on a photosensitive film. Under the action of photochemical processes the image is “recorded” on film and in the future it can be restored by developing.

Though digital cameras look like as analog, they apply varied principles of work. Both cameras have the system of lens, aperture and shutter, but recording principles differ drastically. The digital camera stores shots in digital format on the special media. Closer examination helps to understand the difference in operational methods.

The heart of a digital camera is CCD (charge coupled device) hidden behind the aperture and consists of a photosensitive semiconductor elements made from a great deal silicon diodes. When the light reaches the CCD, it charges each of the elements – pixels individually.

This charge in the future corresponds to an electric pulse, and we receive the data in digital form about illumination intensity of each pixel. As it is impossible to record all information about the whole shot, but in future it is treated by software for recovering lost data and recorded on magnetic media. So, the digital photography is a combination of CCD sensor, software and memory cards, replacing the film in the analog camera.

CCD matrix is not greater than the nail on the finger, and contains several millions of light-sensitive diodes, located on the surface of the matrix in the form of columns. Since the matrix responds only to the brightness, the digital camera can produce only black and white. However, there is a way to capture all the colors of the image by using different color filters in the lens: red, green, blue, or a combination of colors that gives the most realistic picture.

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So, what is a digital camera? What are the differences between a digital and an ordinary camera? The difference is that this camera does not have a film; the light, after passing through the lens, falls on the photosensitive matrix (it may be several), it transforms it into signals, digital signals, from which the image is obtained and stored in digital form in the storage of the device (such as memory card); using the display, you can view it and erase at will. The main advantage is the ability to transact with photos, you can make a huge amount of photos; it all depends on the camera’s memory.

Any digital camera has a slot for a card, you are able to delete unnecessary photos and take photos again, not caring about a film. Yes, the first digital camera took photos of not always desirable quality, but current cameras far removed from film ones.

Digital SLR cameras – what is it? This is in fact almost the same as a digital camera. The difference is that inside this camera a special mirror is located, which receives light reflected from it on the matrix. The light falls directly through the objective, and in the digital camera it goes through the auxiliary port.

A big advantage is the absence of such an effect as parallax. Parallax – is the change of apparent position of the object regarding the remote background, depending on the location of the spectator. The interchangeable lenses are also supported. These days there are plenty of manufacturers of digital and “SLR” cameras; the most popular ones are Canon, Casio, Nikon, Olympus, Panasonic, Sony and others.

Digital cameras have made a kind of revolution in photography. The value of every concrete shot is considerably reduced that allows the person, when taking photos, not to worry about that the film can end. Digital cameras allow you viewing your footage immediately after shooting and, if necessary, either delete a bad shot from the camera’s memory, or, for instance, duplicate a shot.

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