Full-time AF keeps the image on the LCD monitor focused at all times without having to press the shutter release button. Note the following:
Using full-time AF will drain the battery more quickly
Full-time AF is not available when the LCD monitor is turned off
For "Card set-up" or "Card cover alarm", the AF operation of the camera does not halt. Once resumed, the camera always puts the AF in action for immediate focusing
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The D90 has three different autofocus modes. In the AF-S mode it will not shoot until it has focused. In the AF-C mode it will shoot when you press the shutter release button even if has not focused. In the AF-A mode the camera switches between the AF-S and AF-C modes so either can apply.Also, bear in mind that the camera doesn't really know what you're taking a picture of. It may focus on something other than your subject. If you're in the single-area AF mode then you control which of the eleven focus points the camera uses. In any of the dynamic-area AF modes the camera decides.For full details on how the various modes work, please consult your manual. You might also check out the Nikon D90 video tutorial.
You are possibly using an Fulltime AF mode for focussing.See user manual page 34 or the AF mode is set to AF Tracking. If these modi are set, the camera continuously tries to focus on the subject, hence the sound.
My camera's shutter will not depress all the way due to a red flash light coming up all the time in the Flash-Ready indicator lamp (refer to pag 28 in the Nikon manual). It can be full sun outside but it will not work due to the red flash light coming on.
A work around is to select a flash mode of 'cancel'.
There is a button toward the front of your camera called the flash mode button. Click that until you see strike mark on the flash icon of your monitor screen (see page 32 in the Nikon manual).
The camera must have a malfunction of determining the lighting so it always thinks you need to have a flash on the picture. Of course this is not 'fixing' the flash/lighting issue but you can take typical day pictures for now with this work around.
AF single or AF continuous can be selected. In AF single mode, focus is calculated and set when the shutter-release button is pressed partway down. This mode is mainly useful for a stationary subject. In AF continuous mode, camera continues to focus on a moving subject even when the shutter-release button is pressed partway down. It is convenient to capture the moving subject. Full Time AF that continues focusing without pressing the shutter-release button can be used in both AF modes.
AF single or AF continuous can be selected. In AF single mode, focus is calculated and set when the shutter-release button is pressed partway down. This mode is mainly useful for a stationary subject. In AF continuous mode, camera continues to focus on a moving subject even when the shutter-release button is pressed partway down. It is convenient to capture the moving subject. When setting spot focus point in AF continuous mode, subject tracking can be used.
(Subject tracking can be turned on/off by the recording menu. )
When selecting the Spot Focus Point, Full Time AF can be used*.
* Full Time AF can be turned on/off on the setup menu.
* Sensors mounted on the grip and on the eyepiece detect when the camera is held.
The following three settings are selectable during the movie recording: Continuous AF: The single-shot AF is operated in advance of recording, and AF is always operated during recording. Single AF: The single-shot AF is operated in advance of recording, and the focus position is fixed during recording.*This mode is useful for shooting a low contrast and hard-to-be-focused subject, such as fireworks. Manual: The focus point is to be set manually in advance of recording, and its position is fixed during recording.*Manual focus is useful when it is difficult to focus automatically.
This setting helps to conserve battery power by restricting several functions: The back LCD monitor cannot be turned on while in a shooting mode, it will turn on while in the Play mode. Full-Time AF (auto focus) cannot be used and the viewfinder will turn off after the 30 sec. without use.
Full-time AF keeps the image on the LCD monitor focused at all times without having to press the shutter release button. Note the following:
Using full-time AF will drain the battery more quickly
Full-time AF is not available when the LCD monitor is turned off
For "Card set-up" or "Card cover alarm", the AF operation of the camera does not halt. Once resumed, the camera always puts the AF in action for immediate focusing
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