Many digital camera jvc bn-v20u battery especially civil levels of digital cameras have automatic metering function, when most just regional metering or central focusing average metering, they can satisfy common situation's shooting metering. And the professional level of digital cameras are more abundant, metering way they can conducting very precise metering, make more accurate exposure.
In most cases, accurate exposure depends on the camera jvc bn-v812u battery work the performance compensation table. Metering table has a lot of kinds, but in digital camera field, they can be roughly divided into two kinds: one kind is measuring the amount of light into sensors, another kind is the light of measuring into digital cameras, one former is more complex, and more accurate. We here digital camera way the comprehensive introduction of metering.
TTL metering
Digital camera jvc bn-v400b battery generally use "TTL" metering, TTL is the lens "English" Throngh the abbreviations, it refers to the camera with the light sensor to measure the light is the same received.
Based on the test data of light picture (or frame) location or region can be different, divided into the following several ways to TTL metering central focus, matrix metering and spot metering. For ordinary requirements exposure, most cameras either use a central focus metering, or adopt matrix metering, these two methods can usually make the light the whole picture measured the exposure, the photographer, get exposure average images. In general the traditional camera jvc bn-v11u battery or civil high-end digital cameras are a little metering, spot metering are often used to some special USES, such as requiring accurate a point light and ignores the pictures of other parts.
The central focus metering
The central focus metering is one of the most common metering system, has built-in metering function in the camera jvc bn-v507u battery, mostly have the metering mode. It basically is the comprehensive measuring into the camera in the central and picture frame around photos of light, but with the central area measured, give priority to, comprehensive consideration of the picture frame around ray, basically, measurement of the amount of light from the photos, 80 percent of the central area, and only 20 percent from picture frame around area. This kind of metering mode means that any of the picture can be adjusted in central to the whole body will have great influence on average metering value.
In short, the camera black areas, points to picture in this part may be normal, but other parts exposure exposure overdose, opposite contrast, this kind of situation is in the scene in various lamplight cases often occur, consistent and enjoy the sunshine and shadow areas scene, this kind of situation, photographer using this form of metering tend to get a more average value, to choose dark area, then select lit areas metering, then average this two value set aperture and shutter speed, so that the whole area is accurate exposure.
Matrix metering
Matrix for the analysis of metering scene light more accurately, the metering system will be included in QuJingKuang scenery is divided into several parts and derive respectively metering compensation in different areas of the value, and then phase opportunity to these comprehensive, obtained numerical values, such a total metering detected the final decision and numerical average exposure may vary considerably. Different camera jvc bn-v408u battery makers use different metering system and matrix to determine the camera shutter speed and aperture priority setting, the metering index has become measuring standard of performance is one of the camera.
Spot metering
Spot metering is another kind of decision method of exposure is set camera,jvc bn-vf707u battery it depends on the measurement of the light of one small pictures of the central area, and will not suffer the influence of other area light. In this way the photographer focuses on a particular area, and need to ignore other scene is very useful. Spot metering for selected areas can provide accurate exposure, and other parts of the photos or exposure overdose, either underexposed, in order to achieve the effect of need.
Exposure compensation
Metering of another kind of method is "exposure compensation." Although the camera's automatic function can make metering basically meet in the general shooting, but not all occasions are so "have ability", but also for automatic metering the corresponding adjustment for human can drastically improve picture exposure. Metering system always has this or that limit, or is a problem, is either metering light itself to have jvc bn-vf815u battery problems, "exposure compensation" deal with these defects is a necessary measure.
For some backlight objects, most metering device will often misjudgments, or exposure excessive, either under exposed. Strong white light can cause metering device measure underexposed numerical, such clap a photo looks overcast, this is the quite typical metering error, it often happens in various ways of metering.
To this kind of circumstance, "exposure compensation" control is a very effective tool, it can let photographed in automatic metering outside set by adding some extra set of the light, thus replenishing exposure. Exposure compensation units are EV (exposure value), many traditional camera, digital camera jvc bn-vf808u battery, etc all have this function.
In the background is too light or white, black accounted for most of the regional picture when, often can make automatic metering accuracy greatly reduced. For example, when filming the white snow snow for metering affects the metering, which affect the camera Camcorber Battery setting from the selected aperture and shutter speed. In the foreground is bright, metering device when it's very difficult to assess, finally the background of the background pictures will appear too dark, use "exposure compensation" can reduce prospects for the impact of metering brightness, so as to improve the overall picture quality, such as light Settings - 1/2EV or - 1EV can make background warming and not make prospects exposure excessive.
The preset camera's program
Cameras, just as its name implies, it is to point to program for different shooting scene and choice of default camera, such as you can choose program shutter speed preferential or aperture priority "S" or "A" program, still can choose "outdoor" or "landscape" program. "Aperture" and "the shutter speed" these two variables are connected, more light (large aperture) means a shutter speed, greater depth of field (small aperture) means slow shutter speeds, no matter choose what kind of shooting programs, but cannot make exposure errors, the wrong program choice would affect the quality of the final image, for instance in use when insufficient light, so the camera aperture priority programs program will make shutter speed is set in slow, which will make the gear vibration, leading to the camera jvc gz-hd3 battery photo blur.
ISO setting any relationship with exposure?
ISO values is concerned for the film, it refers to the film contains chemical responses to light sensitivity. This standard is now used in digital camera sensors, all the digital camera manufacturers for sensor adopts the concept of the traditional camera ISO ISO digital smaller, and the slower the photosensitive speed sensor.
Digital camera JVC BN-VF823U Battery, choose sensor ISO values directly limit the scope of the exposure camera. 100 degrees sensor and ISO 100 film speed of response is the same, and ISO 40 than the sensor ISO100 sensor slower reaction speed, so will the sensor Settings for ISO 40, need to use a slower shutter speeds or greater lens aperture.
Finally, and, much like film image sensor could play the role of compulsory affect exposure. Digital camera sensor degree in electronic form, can directly to ISO numerical changes, thus affecting exposure. Will the ISO values increase can make the photographer to underexposed scenes. But as with film, when you improve ISO value, also involves pixelated, color change and image edge of some changes. Therefore, you'd better try out the camera JVC BN-VF815 Battery , ISO image sensor observe different to what will shoot image quality.
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