The Nikon D90 has a total of eleven focus measuring fields that cover a large part of the image. The D90 provides numerous functions to adjust the type of focus. The D90 offers a very powerful autofocus system. The Multicam 1000 autofocus module offers two measuring systems: one with eleven measuring fields, as is known from the D2 and D200 models, and a measuring system with an enlarged measuring field in the center of the image. This makes it much easier to focus on larger objects. The many measuring fields offer a lot of advantages. Thus, the photographed object does not necessarily have to be in the center of the image. Moving objects can be tracked by the autofocus - the camera automatically switches between the different measuring fields. In the individual functions, there are also various functions for fully utilizing the possibilities of the autofocus system. The speed of the module leaves nothing to be desired. Many situations in which you need to switch to manual focus in other camera models can now also be performed by means of an autofocus for example, for many photos in the macro area or for sports photography.
You have different ways to focus automatically or manually - depending on what lens you are using. Some lenses offer the option of manually focusing despite the autofocus function. The following figure shows such an M / A switch. At the M position, the autofocus is deactivated - no matter which mode was set on the camera. If lenses do not have such a switch, the lens's range setting ring can only be used for focusing when manual focusing is applied to the camera body. For older lenses without a processor, you must always focus manually. If you are using such lenses, you will not be disturbed by them when these lenses were up to date, the automatic focus was still unknown. The autofocus mode is set with the focus switch on the left side of the camera under the lens release. In the AF position, the autofocus is activated. Use the following button to change between two different autofocus modes. AF-S indicates the single focus. The camera focuses when the shutter button is half-pressed.

If the sharpness indicator appears in the viewfinder, the measured distance is stored. The triggering is only possible in this mode if the motif has been correctly focused otherwise the shutter is locked. The mode is, therefore, good for taking pictures of static subjects. In AF-C mode, however, the sharpness is continually adjusted when the shutter button is half-pressed. Predicate tracking is called this. The camera calculates the position at which the object could be at the time of exposure. The D90 "thinks" with. This mode is suitable for moving subjects. By default, a trigger priority is set, so that triggering is possible even if the subject has not yet been focused. AF-A selects the mode automatically.

To select autofocus measuring fields, you need the multi-function selector. In order to prevent accidental adjustment after selecting a single autofocus measuring field, the lock switch for the pre-selection of the measuring field must be set to the L position (for the lock). This option should be used as it is very easy for the multi-function selector to be adjusted with the thumb during shooting. The other functions of the multifunction selector are not affected by this lock. As impressive as the extremely many autofocus functions are, most photographers will decide for a variant and then stick with it. Nevertheless, it is very handy to be "armed" in any case. Ultimately, the task is decisive for the selection of the measurement field control. Sportfotographs are different settings  single car focus. For static motifs, the S mode is useful, since the object can be triggered only if the object is really focused (200 ISO, 1/320 sec, 31 mm, f 9, photo: M. Gradias). As photographers dedicated to "artistic" photography.

Presumably, a lot of photographers will use the single-field control, since you have the best control, where the sharpness in the picture is measured. Depending on the task, you can decide whether you want to access the small or the enlarged measuring field. Once you have chosen a measuring field size, the relevant measuring field can be selected. Incidentally, if a dark image makes the visibility of the black markers difficult, the grid lines and measurement field markers turn red - very handy. To select the autofocus area, use the multi-function selection buttons. Note that the lock switch is unlocked. Check the settings in the display or viewfinder. The rectangular symbol indicates the current measurement field selection.

Three additional measuring field types are available with the individual function a1. The dynamic measurement field control functions somewhat more complicated than the single-field option. Here too, the measurement field selection is performed manually. However, in order to determine the correct focusing, the information from the other measuring fields is taken into account by the D90. If the object to be photographed leaves the currently selected focus measuring field, it is tracked and the sharpness adjusted accordingly - but the current measuring field is not changed. This mode is preset in the exercise mode. The following symbols are shown in the display - the current measuring field is highlighted.

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