The zone matching mode that both the Dynax 5D and Dynax 7D feature selectively adjusts the tonal curve to the respective high-key and low-key situation and provides an emphasis on the corresponding tonal areas without loss of detail or noise, thanks to an selectively extended dynamic range. Depending on the subject, high-key mode or low-key mode can be chosen. a.) High-Key mode High-key mode provides fine highlight detail on images that consist of mainly bright areas. Exposure, sensitivity and gradation are adjusted in the best possible way so that the hightlights do not bleach out as would be quite common with the standard setting. Wedding pictures depicting the bride dressed in bright white illustrate a prime example of a high-key scene. With the high-key mode an ISO sensitivity of 250 (Dynax 7D) or 200 (Dyanx 5D) is employed and the image is less exposed. This ensures that the analogous signals of the CCD sensors regarding the highlights are not given too much weighting, as this would otherwise preclude their delivering any useful information. The tonal curve is selectively raised in order to obtain the optimal brightness values in the highlights and in addition all tonal values are maintained. b.) Low-Key-mode A low-key scene depicting predominantly dark tones and colours is improved by the low-key mode which achieves a balanced shadow detail without noise emerging in the dark shades. This is accomplished by selectively decreasing the gradation combined with giving a slightly increased basic exposure. With the low-key mode an ISO sensitivity of 100 (Dynax 7D) or 80 (Dynax 5D) is employed and the image is exposed to a greater extent. This ensures that the analogous signals of the CCD sensors concerning the shadows provide sufficient information. Then the gradation curve is decreased so that the brightness values meet the optimum in the shadows and additionally all tonal values are maintained. The low ISO setting ensures moreover an almost free of noise reproduction of the dark tonal values which the low-key image predominantly consists of.