It may be necessary to take a couple of extra readings when using the incident meter outdoors in a high contrast situation. This is explained better than I can do in Phil Davis's Beyond the Zone System, but as I understand it, the incident meter reads the light falling on the meter dome, so in a high contrast situtation, if it is in direct sunlight, it will give a high reading, and in the shadows it will give a low reading, which can help you decide whether to increase exposure, reduce development, or take some other steps to manage the excessive contrast.