Understanding How Digital SLR Camera Metering Works (DSLR)

Understanding How Digital SLR Camera Metering Works (DSLR)


What is Metering? What is the point?
In principle, it is not unlike the roll meter used by the construction worker or the tape measure used by the tailor for the long size, only this metering is used by DSLR cameras for light, which is relatively more meticulous than the length.

Metering is used to measure the light seen by the camera (light entering the lens). When we look at a photo object through a camera viewfinder, the way light in this object will be measured by the metering system. The main purpose of the camera metering system is to produce a photo that fits its exposure (read again the exposure meaning). Metering by analyzing the light darkness of a photo object then determining the size of the shutter speed, aperture and ISO are enough to fit your photo, not too dark and not too bright.

Hmm his dizziness .... okay, gampangya begini.Bayangkan your eyes. When you feel the glare of what you do? squinting eyes instead! You unconsciously reduce the amount of light coming into your eyes is not glare (not too bright). Conversely, when you feel the light is too dim you automatically open your eyes wide. Squint your eyes or open your eyes wide to look calm when you see (the right exposure), like a feature.

How Camera Metering System Works & Weaknesses
When the camera sees the wall, the metering system will be very large light reflected by the wall (reflective). This is easy when all photo objects reflect the same amount of light.

Fuss, in real world each object has a different level of reflection. When we take pictures of the sky, if the sky is perfectly blue the camera's metering will be easy to calculate exposure because there is only one bright level to calculate (blue). But when we shoot the sky with the addition of white clouds, metering must now discourage bright blue sky and white cloud brightness and should strive to produce optimal exposure. Now add the mountain and the color of the trees into the picture above, then the level of complexity that metering hold more complicated.

How is the designer of this camera metering system? The answer is how to make your own. Technically speaking, the average dark light for the 18% gray (18% gray or gray normal) camera metering system - not too dark and not too bright - see photo below. A photo object with a reflection level of light that has a bright, complex darkness will be "domesticated" in this way.
This solution in general can indeed be used to take pictures of normal conditions. But when we are faced with conditions eg you will photograph a friend's face with a perfectly white background, the camera will make your friend's face darker because it has a white background and flies towards 18% gray aka underexposed. Or for example, when you take a photo of a flower in a small glass glass placed on a black tablecloth, the photo will be brighter than the black tablecloth to the 18% gray or overexposed.

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