In photography, metering is a process of measuring the lighting to produce a good photo. Metering is a photographic process that can be automated in addition to WB (white balance). So, when it comes to auto / manual, actually it just a matter of taste.
Metering is actually a very small portion in a photograph because there are 3 factors which are predominant, namely: composition, angle and moment. Although the portions are small and can be corrected to a certain extent. Errors in metering that can still be corrected if: 1 stop maximum over, or 2 stop maximum under.
Metering process begins by reading the camera's manual. Master the buttons and parts associated with the metering. Metering will be very easy if scenery who photographed with lighting average, it means neither was very bright or very dark.
Metering activities started by choosing what method will be used. Generally, there are three kinds of metering. But in new cameras, there are several additional methods that actually just variations of the 3's.
The first method are Matrix metering or Evaluative Average, which measures shooting area by averaging the light. Evaluative metering analyze the whole field to be photographed and then make conclusions. different cameras will produce different results, though only a little.
The second method are Center Weight metering (CW). If Evaluative averaging the entire surface of the photograph, CW only about 40 percent of the center. Spot metering are the third method. Generally, this method is not effective for a quick shoot. Vice versa, the relatively safest method for photographing in general with the terms are always ready with a compensation is matrix method.
Before going any further, let us first understand what is done by the camera when doing metering. When performing metering, the camera measures "brightness" that "sees", and then calculate the aperture and shutter speed what it needs.
Now I want to make sure, if you already know how to use the lightmeter in a camera to do the metering? Read the manual!
After understood how to use the lightmeter in your camera, let's begin to explore what it is metering.
Now, try to metering in the three alternate outfit. Will look different results, right? In fact, with the same light source, metering in the three shirts should produce the same numbers.
Dark shirt tends to give slow speed of the metering calculations, whereas light clothes instead right? The camera measures the "brightness" to be any gray 18 percent in the photo. That is the main principle of metering.
In metering, the point is that the image measure has "brightness" as desired. Not a matter of right or wrong! Metering simple way: use evaluative, that happens too light, repeat with minus compensation. In retrospect the results for the other times.
Metering science is not just the science of doing. But also need to memorize specific cases: the model back to the light, and others.
Gray 18 percent is gray with an optical density of 18 percent. You can buy graycard 18 percent in the photography shop. 18 percent gray example can be seen as in the picture below.

Before going any further about the metering, metering and graycard color here is not a matter of but it a matter of "brightness". dark shirt showing metering by the camera slow because it will be converted black to gray 18 percent (which is brighter). Similarly, the white will be fast because the camera metering will be 18 percent gray (which is more "dark" of course).
When shooting, you perform metering on the area to be photographed. For accurate results, use SPOT to the area that is approximately 18 percent as bright graycard. Metering this way can only be done if you do not hurred up, for example photographing sunrise / sunset. Quickest way is with evaluative metering, and use your intelligence and experience to perform compensation.
So, it is a matter of selecting metering method and compensation. After being able to, automatically or manually does not make any difference. But the best metering measurement is to measure directly the light from the source to the lightmeter separated.
For photographing landscape, you can use the spot, in an area measuring approximately gray18% or evaluative use with average compensation 0.3 stop. For shooting stage, evaluative use, with compensation of minus 1 stop to 3 stops.
watch the photo A. This photo is not a simple metering. If you perform metering with what it is, the resulting image will be too bright.
A photograph with many black parts, you should measure the spot to the roughly 18 percent viscosity as graycard. If you use matrix methods, you should be compensated so that measurements recorded a black to a black.
Photo B need not compensated because of the relative density average is approaching 18 percent graycard. If you want a more intense blue, so-so compensated minus half or one stop.
Photo C is a photo of dark background stage. Photographing these circumstances, similar to a photograph A. Compensation shooting you with a minus. How many minuses? Plenty of practice, and the results of this exercise properly remembered.
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