One of the biggest strengths of manual focus lenses and the reason why so many photographers love using them has to do with a process called zone focusing–and Zeiss Milvus lenses like the 18mm f2.8 and 15mm f2.8 lens themselves well to this. For years the methods around zone focusing are what has allowed many photographers to outdo the fastest focusing autofocus cameras and lenses. Street photographers, landscape photographers, and many others have used the technique to ensure that they get sharp photos. When film photography was king, lots of photographers did this to ensure they got “the shot.” Digital photography and its inherent nature requires photographers to get even sharper photos.
When you’re shooting landscapes and architecture, you really want the best you can get. With manual focus lenses, sometimes the best thing to do is to use zone focusing.