Capturing panorama photographs with consistent exposure across the scene can be challenging in most outdoor lighting situations. For this reason, it is important to learn to use the manual exposure setting on your camera. By using manual exposure, you the photographer are deciding how you want the scene to look across the entire panoramic. This will ensure the entire picture is exposed exactly the same way.
To control the exposure of your panorama photograph, look at the scene you plan to capture and determine what is the main subject of the image. Once you know what should be properly exposed, set the exposure according to that area in the scene and switch to manual exposure mode. After taking the series of images, review them to see if parts of each image are over or under-exposed. Adjust the exposure accordingly and reshoot the series for the panoramic. It may take a few tries to get all the images where you want them, but the nice thing about digital photography is the we can fix our images almost instantly.