【School】 digital camera parameters weak Detailed】..

<br> digital cameras, this new phase in mind soon, and now has spread up, and that proportion has more than a traditional camera, and in the outside market, can buy, usually a digital camera, and .In our general view, digital cameras and traditional cameras, the difference between the use of film is probably less now, because it can save a lot of money, oh, then what is the Digital machine recorded it, it and any difference between the traditional cameras have some .it, now we take a look! First, the definition of a digital camera: <BR> 1, digital camera (Digital Camera, referred to as a digital camera) is a use of electronic sensors to the optical image into electronic data camera. .With ordinary cameras on film by chemical changes of silver bromide to record images of the principle of different digital camera sensor is a light sensor type - {zh-cn: charge-coupled device; zh-tw: charge-coupled components} .- (CCD) or complementary metal oxide semiconductor (CMOS). .2 photos are not captured on film, but the use of electronic image sensor to replace film cameras. .Second, buy a digital camera image sensor to clear the parameters of the image sensor, usually a charge coupled device (CCD, the camcorder with the charge-coupled device used in a similar) is the core of digital cameras. .Sensors used in camera, the number of pixels is not the only factor in the quality of photos, but it is a major factor. .The most high-megapixel cameras can produce clear images, the most realistic and the most realistic skin color tones. .Some digital cameras use CMOS (complementary metal oxide semiconductor) sensors to reduce costs, but this would bias the captured image is not enough black and fine. .Image sensor is divided into CCD (charge-coupled device) and CMOS (complementary metal oxide semiconductor) two. .The main argument in favor of the CCD chip, the chip is more sensitive than CMOS, it can be under the lights in the dim light the better photos. .CCD chip camera with photo lights than the CMOS clear, sometimes using the COMS chip "noise" problem - the image some shortcomings. .But the other hand, CMOS chip, low cost, where cost savings can be converted to a lower camera prices. .In addition, CMOS chip than CCD chips absorb less energy, so the CMOS camera chip can be used to change a battery longer. .<BR> For image quality considerations, most current digital cameras use CCD technology. .<BR> A good digital camera lens is not only dependent on the resolution to improve quality. .Will be able to see the good things sent to record the image sensor for use, depending on its lens. .<BR> Focus in the traditional camera, the lens focal length refers to the center to the distance between the photosensitive film. .On a digital camera is the lens focal length from center to the distance between the image sensor. .We will find the digital camera lens focal length on the nominal value of smaller than traditional multi-camera, such as NIKON COOLPIX995 the camera focal length of 8-32mm. .This is due to the design of a digital camera lens focal length of the actual film than the traditional 35mm camera focal length much shorter. .Usually the information in the digital camera or specification mentioned in the focal length is equivalent to the traditional camera focal length, such as NIKON COOLPIX995 camera focal length equivalent to the traditional camera 38-115mm focal length. .Optical zoom helps you easily change the focal length, zoom highlight the desired image detail and the omission of unwanted background, of course, increases the cost of the camera. .Now most of the high-end digital cameras use a 2 - 3x optical zoom lens, the lens is still used in some non-spherical lens, which effectively reduce the aberration and dispersion. .Triple zoom lens has been enough for most people, but if you want to use the lens for greater flexibility or get some special effects, you should choose a camera with a lens attachment, such as NIKON's .digital camera to provide additional distance, wide-angle and fish-eye lens. .If the lens is very important to you, then agreed to ensure that you buy a digital camera with optical zoom rather than digital zoom. .Optical zoom is a true zoom lens. .Digital zoom just means that the camera's internal image processing. .At that time, digital zoom, the camera zoom in the middle part of the picture and cut out around the edges. .As a result, the image processing software and open an image, cut around the photo, then enlarge the remaining portion is the same. .For the "zoom" area of the enlarged image resolution and reduced image quality. .<BR> Some digital cameras have a fixed focus focus (fixed focus) lens, that the focus can not be changed. .Typically, this lens makes the image in front of a few feet away from the camera to infinity focus can be clearly presented. .Many cameras have manual focus, which allows users to adjust the focus of three different distances. .These settings have a macro mode for shooting in particular close, portrait mode for shooting dozens of feet away from the camera, objects, landscape mode for shooting distant objects. .Digital cameras have very short focal length lens is one of the advantages of a very large depth of field. .This means clear that the focus (ie, a fixed focus camera) of the area than the typical film camera is much greater. .<BR> Different cameras with different focus range, which for close range photography is probably the most important. .If you want to do a lot of close photography, then you must be on the camera and the minimum distance between the main body for comparison. .With auto-focus camera lens according to the distance from the main body to automatically adjust the focus. .Most cameras with automatic focus function called focus lock is available (focus lock) very useful features. .This feature can be used to point out exactly which camera you want to know the object of focus, no matter what position the object on the screen. .Usually you put the viewfinder, aim the center of the object, press the shutter button half of the focus lock, then move the viewfinder, compose and take the picture. .A small number of high-end digital cameras allow you to set a specific distance from the camera focus. .This feature is very useful sometimes, because when shooting a complex scene when the auto focus mechanism is not necessarily always well focused. .For example, if you want to shoot a tiger cage, auto-focus might have to lock the focus, not the tiger cage on. .The advantages of digital camera lens works as a digital camera, the lens does not need to keep the focus on standards in front of the middle position. .This, some digital cameras that can rotate or detachable lens, such as NIKON COOLPIX995 can be rotated 270 degrees to provide a three times optical zoom lens, the Minolta Dimage V digital camera, camera body is provided with separate lenses. .Pictures up so you will have greater flexibility. .<BR> Control characteristics whether you are a fan of photography, the camera control features are critical. .Aperture and shutter most digital cameras have automatic exposure according to the procedure works. .Some high-end models also offer aperture-priority auto exposure, that you select the aperture setting, and then the camera when the light under the camera, if necessary, adjust the shutter speed, provide the correct exposure. .Most cameras have at least two aperture settings - typically a setting for the light dark places, one for bright situations. .If you are an experienced photographer, traditional camera, you may want to provide a variety of camera aperture setting and shutter speed for comparison. .If you are truly a master photographer (or one day become a master), you may want an option to manually adjust the camera exposure. .Usually the exposure compensation adjustment is provided in the form, allowing you to select the automatic exposure mechanism based on the option to increase or decrease the exposure setting. .<BR> Metering Another consideration relevant factors and exposure metering mode digital camera (metering mede), metering mode determines when the camera determines the correct exposure time is how to estimate the amount of available light. .Some high-end digital cameras allow users to select the different exposure metering file. .(Read your camera manual to see which button or menu command function can be used to select different files.) In short, the so-called metering function is carried out using the camera auto exposure metering mechanism, a method of calculating light the scene, .it is to calculate the correct exposure when taking pictures of data. .There are several common Metering: Matrix metering (matrix or multizone metering). .Sometimes this method is called multi-zone metering, is the framing division into small cell (matrix), the analysis of each small cell in a number of different points of light, the camera to select the shooting scene in accordance with its bright and dark parts in the most comprehensive .good exposure data. .This function is the standard default auto exposure function files, in most cases be able to capture good images. .Center-weighted metering (Centerwedto meterng). .It measures the light throughout the area, but more emphasis (weight) scenic central part of the light. .Area who want to take the edge part of the object relative to pay more attention to the case of central part of the area, you should use this metering method. .Spot (Spot metering). .It is only measuring the light center of the scene area. .When the brightness of the background brightness of the object is high compared with the most effective in this way, such as the background of your shot is very bright objects (objects in front of the sun or other light source). .If you use matrix metering or center-weighted metering method, the object may be taken out of overexposure, because the camera is reduced due to the brightness of the background of the exposure factor. .Low-end digital cameras usually provide only a metering mode, while the more advanced digital cameras allow users to capture an environment based on the way from the three metering options. .Light of different color temperature white balance adjustment is different, of a light source contains different proportions of red, green and blue light of a profound statement. .Color temperature is Kelvin (Kelvin) measured the degree to which you do not really understand the concept, unless really prepared and experienced film photographer or cameraman on this issue. .Color temperature of sunlight at noon is about 5500 degrees Kelvin, usually abbreviated as 5500K, and 5500KB `Do not be confused. .These two words represent two major categories of technology, photography and computers, while there is likely to cause confusion. .<BR> Any case, the light source color temperature can affect the camera (including video recorders, digital cameras and traditional film camera) the object being photographed on color recognition. .If you take pictures under fluorescent lights, you will find some photos hair green. .The color from the color of fluorescent light. .Photographers can use traditional film cameras to compensate for different light sources of a special film or color filter. .But digital cameras, including the camera is using a balanced approach is called the white color temperature issues. .Simply tell the camera white balance in the current light conditions, how to mix red, green and blue light to synthesize pure white light. .Camera based on this data as a basis for accurate reproduction of the scene in a variety of other colors. .Most digital cameras can automatically handle white balance, but in some special cases (such as dusk, under fluorescent lamps) are often ineffective. .So most of the newer models, the high-end cameras offer manual adjustment of white balance function. .<BR> Burst mode shooting some low-grade digital cameras, you need a few seconds for automatic focus and automatic exposure settings; together after the shooting process and save the image in the storage device types also need a few seconds time. .If you need to use flash, but also left a few seconds to recharge the flash. .This will undoubtedly bring to the photo inconvenience, especially if you want to catch some of the exciting moments time. .Therefore, some digital cameras can provide rapid shooting function. .And different brand or model of camera in this function and is slightly different. .Some called the 16 Zhang burst, ie the shutter, the camera can record 16 consecutive images in the same photo, it's disadvantage is that resolution is not high, and can not use flash. .Another continuous shooting mode lets you press the shutter button to capture a series of images, rather than a few small photos on the map. .Then do not let go of your hand as long as the shutter button, the camera will pause the prescribed intervals not to shoot. .If your camera has this rapid shooting function, you can check to see if you can set, in a certain period of time shooting more or less image. .More advanced digital camera features in the cache device inside the camera, allowing you to high resolution mode the camera as high as the traditional high-speed continuous shooting. .Now, some brand-name high-end digital camera models generally have this feature. .<BR> Flash and control are generally built in digital camera flash, you can dim or low light conditions to take pictures. .You can also set the flash mode according to need, such as automatic flash, forced flash, red-eye reduction flash and no flash. .However, most current digital camera flash is lower, the flash range is smaller (usually about three meters), so, some high-end digital camera with external flash interface, sync cable or through an external flash hot shoe, while others have .slow sync flash and other settings, and can adjust the flash of flash digital cameras began to appear. .Most digital camera LCD monitor has a LCD (color LCD) screen. .LCD screen is like a miniature computer monitors that can display images stored in the camera. .LCD is also used to display the menu, allowing users to modify the camera settings and memory from the camera's delete unwanted images. .View and delete the images on the camera function is very useful, because do not want to save the image to download the time it takes. .If, as out of the photo is not the way you want, you can remake it deleted. .<BR> LCD on most cameras can also be used to preview the photos you want to shoot (SLR viewfinder of digital cameras because of its optical structure, to be able through the LCD viewfinder, such as OLYMPUS-2500L). .So if your camera has a traditional viewfinder and an LCD, you can use the LCD or viewfinder to select photos of the border. .When shooting close-range, when most of the cameras force you to use the LCD, to avoid the visual errors. .A small number of cameras on the LCD viewfinder is not the traditional, all photos must be used LCD composition. .Actually use the LCD viewfinder when shooting is sometimes difficult, because in order to see the shooting scene, you have to take the camera to make it in a few inches away from your place. .If your hand is not so stable, to keep the camera when the camera is very difficult to achieve fixed. .In this case, use a tripod is especially important. .LCD monitors are also some disadvantages. .It increases the weight of the camera, they also consume a lot of camera battery power. .In addition, when you're a bright light LCD or not to face when taking pictures of different angles, LCD display becomes dull, so you can hardly see the screen to shoot. .However, this problem is gradually being resolved, some digital cameras now use low-temperature polysilicon LCD for manufacturing materials, greatly reduce the power consumption, save energy. .Some digital camera also features a wide viewing angle LCD, LCD from different angles that can be clear, bright viewfinder. .<BR> In addition, LCD pixels to determine their quality level is also an important factor. .Currently, most digital camera LCD, 11 million or more pixels, the LCD can often better reflect the image detail, and some digital cameras to reduce cost, low-pixel LCD (Fuji 2800's LCD is only 6 million pixels) .These images displayed on the LCD showed a granular, and very slow refresh rate, obvious lag when shooting sense. .<BR>.