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While Spot meter is recommended to be used for precise exposure metering as featured in the previous issue, the Partial mode is suitable for situations where the subject matter is occupying a larger area of the frame as compared to the former, which is usually intended for subjects that are far smaller. A Partial meter can instantly takes into account two sections of a given scene due to its larger metering area. For example, the third photo in this issue (of the backlit brown building) was recorded after it had read both the exposure values in the highlight and shadow areas in one sweep. In this photo of the Sunway Pyramid Mall's compound, the exposure was based on the reading obtained from the center area where the complex and ground met. I don't have to worry about what exposure readings that may be given by the sky, the trees or the various signs in the foreground.
In the above photo (right) of the LRT system, the Partial metering was used to take readings from the front panel of the train as well as the brightly lit spot (center) of the building in the background. Exposure is spot-on with the Partial metering mode in this photo. On backlit subjects, it has been explained in previous issues that both the Evaluative and Spot metering modes can render perfect exposures when used with the EOS cameras. The Partial metering mode, too, can do the same. With Evaluative metering, the EOS user has to make sure that the optimum AF point has locked into the right subject, failing which the exposure will be incorrect. For Spot metering, shooting against the light is not a problem for it. Since only the Canon EOS-1N/EOS-1N RS, EOS 5 and the new EOS-3 have the Spot metering feature, users of the other EOS cameras have no choice but to rely on Partial metering to get their exposures correct if they feel the Evaluative system may not be suitable for certain backlit shooting situations.
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