Using the Partial Metering mode of your EOS cameras. In addition to the multi-zone Evaluative metering system, all Canon EOS 35mm SLR cameras do have another built-in light meter mode, called the Partial. This mode is also known as Selective area metering due to the larger diameter (about 7-9 per cent) it occupies, compared to the Spot, which is 3 per cent or less. Partial metering is also a Canon exclusive; it was first made available in the original F-1 professional 35mm SLR camera introduced in 1971. Unlike the Spot or Multi-spot metering systems as described in issue #16, which is available only in high-end EOS cameras like the Canon EOS-1N series and the new EOS-3, the Partial mode is available in all the current EOS models ranging from the entry-level EOS 888, EOS 88 and EOS 300 to the midrange EOS 50/50E as well as the professional series. LCD Display showing the Partial mode is selected (left box square) Partial/AE Lock button of the EOS 300 Unlike Evaluative metering, the Partial mode, with its 9 per cent sensitivity area (on the Canon EOS-1N) at the center of the viewfinder, makes it easy to see where the camera is measuring the exposure values. Moreover, since the metering area is larger than the Spot meter, the desired portion of a scene can be metered and the auto exposure reading locked via the AE Lock button. This enables fast AE picture-shooting with the desired effect obtained. Partial meter aimed at highlight/shadow area with AE lock, then recomposed Partial meter aimed at the large window (top left) Partial meter aimed at twin buildings on the right Partial meter aimed at front panel of bus on the left This metering pattern is most effective when precise exposure of the subject or a certain area of the frame is desired, e.g., strongly backlit subjects or strong contrast between light and shadow, such as scenery with a bright sky. It is also effective for AE photography and in close-up applications. Backlit leaves KLCC Suria's logo against sunlight   << Back to Main . 1 . 2 . 3 . 4 . 5 .