By throwing the building and the newspaper out of focus, the woman stands out clearly in the photo and is not lost in a confusion of distracting elements. To compensate for these actions the iris will have to be opened up which minimizes depth of field and creates the selective focus effect. In either case you will need to study the effect in a high-resolution video monitor to make sure you are achieving the effect you want. Follow Focus I n video production we are often dealing with moving subjects. A person may quickly move outside the limits of depth of field unless the lens can be quickly refocused.
Professionals know which way to turn the focus control to keep a moving subject in sharp focus.
The technique of follow focus is used to subtly refocus the camera to accommodate subject movement. The Macro Lens Setting M ost zoom lenses have a macro setting that enables the lens to attain sharp focus on an object only a few inches or even a few millimeters from the front of the lens. Although lenses differ, to reach the macro position on many zoom lenses a button or lever on the barrel of the lens is pushed to allow the zoom adjustment to travel beyond its normal stopping point. Many newer lenses are called continuous focus lenses . These are internal focus lenses that can be smoothly and continuously adjusted from infinity to a few inches without manually having to shift the lens into a macro mode.