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Incorrect exposures can also be "achieved" when you have locked focus and exposure on any scene having a strong difference between the highlight and shadow areas as shown in Photo 7 & 8. The placements of the AF sensors on the main subject (Photo 7) is important since any mistake (Photo 8) will result in uneven exposure.
How much differences in meter values given by the Evaluative system as opposed to those given by say, a built-in spot meter? Not very much, especially when the shooting conditions gave the same readings regardless of the overall brightness. In Photo 9, the vertical format of the other buildings located beyond the lake's banks as in Photos 1-4, spot metering was used on the brown building and the resulting photo is another example of correct exposure.
Evaluative (left) and spot metering used on plants For Photo 10 & 11, Evaluative metering was used on the former while spot was used for the latter. As EOS users can see for themselves, there are no differences in the overall rendition of the images in terms of precise exposure calculations.
In Photo 12, the bright background did not influence the EOS-1N RS' Evaluative metering into underexposing the red Hibiscus flower. In this photo, only the centre AF point was used in determining the exposure required after the camera's light meter has taken into consideration the overall brightness of the scene. If one of the AF sensors have locked onto the background, the result would have been underexposed.
In all the EOS cameras, it has to be remembered when you disengaged the EF lenses off their AF modes for them to be focused manually, the Evaluative metering no longer locks exposure readings from any of the multiple AF points in use. Exposure readings are memorised only from the centre AF point when manual focusing is being used. Also, when the EOS cameras are used in their AI Servo AF modes with Evaluative metering, the exposure values won't be memorised as compared to using them in the One Shot AF option. The readings sensed by the cameras will be constantly changing until the moment of exposure, thus any change in lighting values from point A to B, and the EOS cameras are able to make the necessary adjustments when tracking the subjects. As a seasoned motorcycling GP photojournalist, I found both the Canon EOS-1N and EOS-1N RS cameras are better off in shooting the action scenes using the 16-zone Evaluative metering system than the Partial or Spot metering options unless the lighting situations became too complicated for the Evaluative system. |
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