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For the first photo (top left), it is not difficult to achieve such an overall scene with the EOS 50's Evaluative metering. The scene look blue-ish because the majori portion of the picture is in a deeply shaded area but there are also several highlighted areas in the background. Another example of how the Evaluative meter preserved the details in a high contrast scene like this. As for how I was able to get the exposure correct in the second photo of the KL Tower replica, first, I locked the EF 28-80mm f/3.5-5.6 II zoom lens onto the 80mm setting, activated the AE Lock to memorize the reading, changed the focal length back to 28mm and then started shooting. The phone booths were backlit from a partly shaded 45-degree angle afternoon sunlight. It wasn't my intention to place the booths against the mural of the Malaysian flag since I preferred to have it with parked cars instead. But I later realised the phone booths made an interesting angle for the mural. The Sultan Abdul Samad (SAS) building's famous clock tower was photographed with three of the EOS 50's AF points having locked their focus on it, and the exposure was based on the reading given.
The picture above of a zebra crossing's traffic lights was shot right after I had taken a shot of the phone booths. It really doesn't look very spectacular in reality but the combined shallow depth-of-field and compressed perspective of the EF 75-300mm f/4-5.6 III USM zoom lens (at 300mm) made it look much more interesting as a photo. The photo of the plants and flowers is an easy way which the EOS 50's Evaluative metering has no problem in rendering the exposure correctly without the need for AE Lock or other supplementary methods. When to use the Partial metering mode The EOS 50 also offers two other metering patterns for exposure. Partial metering reads from just a small area of the image in the center while Center-weighted takes an average reading of the whole scene, but with the emphasis on the central area. The EOS 50's Partial metering takes a reading from about 9.5 per cent of the picture area. You can read from just the important area of the subject while ignoring the background. Readings can be taken from the center of the frame or linked to the active focusing point. The question is: How does one know when to use or not to use the Partial metering mode? This has something to with experience in applying the metering aspects in photography. The more knowledgeable you are, the easier it becomes when the choice of which metering mode is the best for the application. Nevertheless, it is a sure formula to use Partial metering when there is a huge difference between the subject's brightness and the background - especially when the subject only occupies about 1/3 or 1/5 of the total picture area and the background is much brighter or darker. Take for example the two photos below of a fountain's top structures utilizing the Wau (Malay Kite) design, which were shot, against the bright blue sky. The photo on the left was shot using Center-weighted metering while the other was with Partial. But they don't look any different at a glance but upon closer scrutiny, you will see that the first photo is darker (underexposed) than the second. The Partial meter allows the second photo to be just right in terms of exposure without overexposing the sky too much.
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