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Digital camera metering
By Jakob Jelling
Snapjunky.com
Looking at the most intricate details of the digital camera as a
technologically advanced device a lot of functions come into play. Such
a point is that of the digital camera metering. This discussion focuses
towards that intention of understanding and knowing the details of the
component. Basically speaking the metering system in a digital camera
measures the amount of light in the scene and calculates the best-fit
exposure value based on the metering mode explained below. Automatic
exposure is a standard feature in all the digital cameras. All that is
requires to be done is select the metering mode, point the camera and
press the shutter release. Most of the time, this will result in a
correct exposure. The detailed explanation and analysis of the entire
process is as follows in the next lines of this discussion.
The metering method defines which information of the scene is used to
calculate the exposure value and how it is determined. Metering modes
depend on the camera and the brand, but are mostly variations of the
following three types. Primarily, matrix or evaluative metering. This is
probably the most complex metering mode, offering the best exposure in
most circumstances. Essentially, the scene is split up into a matrix of
metering zones, which are evaluated individually. The overall exposure
is based on an algorithm specific to that camera, the details of which
are closely guarded by the manufacturer. Often they are based on
comparing the measurements to the exposure of typical scenes.
Next comes the center-weighted average metering. This is probably the
most common metering method implemented in nearly every digital camera
and the default for those digital cameras that don't offer metering mode
selection. This method averages the exposure of the entire frame but
gives extra weight to the center and is ideal for portraits. Another
important is the spot or partial metering. The spot metering allows the
user to meter the subject in the center of the frame or on some cameras
at the selected AF point. Only a small area of the whole frame is
metered and the exposure of the rest of the frame is ignored. This type
of metering is useful for brightly backlit, macro, and moon shots.
Again a lot has been revealed and a lot remains to be done so, yet the
rudimentary foundation of string fundamentals can be established via the
lines of the above lines of this discussion. It is only hoped that the
lines get their true respect from the readers of them and users of the
digital camera to properly deliver the due respect that the digital
camera metering technique deserves.
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About the V I Imagery Website |
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At V I Imagery, our goal is to supply quality art,
photography, and digital imagery in a pleasant, informative, and
relaxing fashion. From the art, photos, and digital images
in our galleries, to the tips and tricks in our forum, we have
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to pages that contain, any faulty or offensive information,
please let us know so that we can correct the issue and insure
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goals.
Thank You,
The V I Imagery llc.
Management Team |
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