Using The Depth of Focus as a brush to impart focus of subject matter
As an artistic photographer one has many tools, both software and hardware, to help create the key message of an image use focus. You can use very fast lenses to create shallow focus or you can use what ever lens you have and software to modify the focal plane of your images. Simple things such as the angle in which you hold the camera can critically alter your plane of focus when creating an image. Many software programs allow you work with blur which can be used to simulate fast lenses or go beyond that by changing the actual dimensional plane of your focus.