Fujifilm FUJIFILM X-E1 Owner's Manual (en)

Focus/Exposure Lock
Although the camera boasts a high-precision autofocus system, it may be unable to focus on the subjects listed 
•  Very shiny subjects such as mirrors or car bodies.
• Fast-moving subjects.
•  Subjects photographed through a window or other refl ective object.
•  Dark subjects and subjects that absorb rather than refl ect light, such as hair or fur.
•  Insubstantial subjects, such as smoke or fl ame.
•  Subjects that show little contrast with the background (for example, subjects in clothing that is the same color 
as the background).
•  Subjects positioned in front of or behind a high-contrast object that is also in the focus frame (for example, a 
subject photographed against a backdrop of highly contrasting elements).