Landscape photography requires complete depth of field. And, when you have two subjects in the composition -- such as the foreground silhouette of this acacia tree in Kenya plus the distant tree/sun in the background -- both subjects must be in focus. Therefore, a picture like this has to be done with aperture priority and you need to choose a lens aperture of at least f/16 or smaller. In this shot, I used f/20. When you use aperture priority, though, you have to pay special attention to the shutter speed to make sure it doesn't become too slow. If you are shooting from a tripod and the subject isn't moving, then the speed of the shutter isn't relevant. In this case, however, I was hand holding the camera while in a land rover and the shutter was quite relevant.
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