Nikon D200 D200 User's Manual - Page 69

Reference-Focus Under the conditions described above, the optional SB-800 and SB-600 Speedlights and SU-800 wireless Speedlight commander will provide active AF illumination for the following focus areas: AF lens focal length Normal frame (11 areas) Wide frame (7 areas) 23-34 mm 35-70 mm 71-105 mm With other Speedlights, the camera AF assist illuminator will be used. Getting Good Results with Autofocus Autofocus does not perform well under the conditions listed below. If the camera is unable to focus using autofocus, use manual focus ( 60) or use focus lock ( 56) to focus on another subject at the same distance and then recompose the photograph. There is little or no contrast between the subject and the background The focus area contains objects at different distances from the camera Example: subject is the same color as the Example: subject is inside a cage. back ground. The subject is dominated by regular geometric patterns The focus area contains areas of sharply contrasting brightness Example: a row of windows in a skyscraper. Example: subject is half in the shade. The subject appears smaller than the focus area The subject many contains fine details Example: focus area contains both fore- Example: a field of flowers or other subjects ground subject and distant buildings. that are small or lack variation in brightness. 59