Depth of field refers to the distance between the nearest object (or potion of an object) that appears in focus and the farthest object (or portion of an object) that appears to be in focus. Depending on the distance from the lens, the focal length of the lens, and the aperture setting, the depth of field can be as little as a fraction of an inch, or as great as infinity.
There are several factors involved in getting better than average sunrise and sunset pics. Many of these will be obvious to any experienced photographers out there. But even the pros have their areas of specialization, and if this isn’t yours, then maybe I can give you a few pointers. You can bet that I read other people’s blogs and articles to learn as much as I can.
Unlike some other types of photography, landscape photographs should include crisp focus throughout, hence the frequent use of tripods or other stabilizing devices. Although I prefer nature scenes, landscape photography is not limited to such. It also includes cityscapes, and can include sunrise and sunset photographs, people, and other natural components such as trees, mountains, and clouds.