Using the EOS-1N RS' 16-zone Evaluative Metering system There is not much difference in using the 16-zone Evaluative metering systems of both the standard EOS-1N model and its high-speed variation, the EOS-1N RS, but I am just featuring a how-to write-up with the latter because personally, I have come across people who still have this thinking. Basically, using the Evaluative system is the same with both models but the EOS-1N RS has the added advantage of letting the user sees the views constantly all the time while clicking the shutter to record the images on film. Getting incorrect exposures from either camera when it is used in conjunction with the Evaluative metering system is usually attributed to user error than anything else. Don't believe it? Read on. Here are three photos that were shot within several seconds of each other in Shutter-priority AE mode and the Evaluative metering system with the EF 70-200mm f/2.8L USM zoom lens. Photo 1 was shot with the meter reading aimed (via AF points) at the canoeing men and the exposure was set accordingly with no error. In Photo 2, the AF point was aimed at the dark green trees instead adorning the lake's banks and the resulting photo is overexposed. Aiming at the buildings looming in the background for Photo 3, the resulting exposure is the same as in Photo 1. This proved that incorrect exposures are due to the user's errors rather than the camera's inability to render the required exposures. Photo 1: Correct exposure of overall scene. Photo 2: Incorrect exposure of overall scene. For Photo 4, to get a correct exposure of both the buildings and their reflections off the lake's surface, all I need to do was to take the readings from the larger building (National Library) vertically, and then recomposed the picture horizontally again before clicking the shutter. Photo 3: Another correct exposure of overall scene. Photo 4: National Library and its reflection. As mentioned in the segment of the EOS 300's metering system, dark green leaves or grass can fool a camera's built-in light meter into setting the wrong exposure values if one is not careful enough. However, if your pictures have other elements occupying the frame with those green plants, the chances of getting correct exposures are made easier as shown in Photo 5 & 6. Photo 5: Green plants against backlighting Photo 6: Water fountain in lake. The slight backlighting effect from the lake in Photo 5 helped the Evaluative metering to render the meter values correctly while the water sprayed from the fountain in Photo 6 allowed the meter to compute its calculations based on the overall brightness of the water and the mostly green background. << Back to Main . 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 .