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Dark green grass and leaves are among the subjects that will give incorrect readings for your pictures especially if they are occupying two-thirds of the frame as they do not reflect back 18% gray, the standard where most built-in light metering systems are programmed to read. But as you can see in Photo A, the tree's abundance pack of dark green leaves did not present a problem for the EOS 300's 35-zone metering system. The blue and green nets used in the construction industry, as seen in Photo B, also did not pose a problem for the camera's Evaluative metering. As EOS users and other photo enthusiasts already know, subjects that are dark browns, whites or pure blacks are other examples that posed a problem for most cameras' built-in metering systems.
However, this is not a problem for the EOS 300's Evaluative system. To prove it, just look at Photo C of the danger sign surrounded by a dark brown background. Exposure for this shot is perfect - both the sign and background are not overexposed. In Photo D, a combination of white, red and blue scaly wall did not fool the EOS 300 into giving the wrong exposure settings, either. All the four photos described were shot using the camera's Full Auto mode (Green Square).
Switching over to the EOS 300's Intelligent Program AE (P) mode, the camera's Evaluative metering system is still performing flawlessly, giving out perfect exposures every time. The row of cars (Photo E) in various colours, is one example despite having the two gray-coloured types occupying two-thirds of the frame. Look at Photo F, showing the blue-coloured windows in between the building's fa*ade. For most cameras, the ability of their built-in metering will react to the brighter fa*ade rather than the dimmer windows, thus giving the wrong exposure information to the cameras. Not with the EOS 300, as the 7 AF-point and 35-zone system prevented it from giving the wrong settings for this photo.
Bright, multi-coloured objects are probably the easiest subjects for any camera's metering system to cope with and the EOS 300 has no problem in this aspect either as shown in Photo G, of the water-pipes' valves. This point is important because tests have shown that some cameras (not the EOS series), due to the programming nature of their metering software, can't differentiate between brightly-lit or brightly-coloured objects. Basically, the EOS 300's 35-zone Evaluative metering system takes into consideration which of its 7 AF points have locked onto the main subject as well as the differences in brightness between the main subject and the background. If more AF points are concentrated on a darker subject than a brighter one, the camera will assume the former as the subject and calculates the settings to give optimum exposure for that picture. Simultaneously, if you concentrate more of the camera's AF points on a brighter subject, the camera will give preferences over it and less on the darker elements. This is fine if you have concentrated the AF points on the correct subject, otherwise you will end up with overexposed or underexposed pictures. Photo H is an example of how the EOS 300 gave a correct exposure on the mannequin biker despite the brighter elements in the background.
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