Question about Nikon D90 Digital Camera with 18-105mm lens

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What is use of AF button - Nikon D90 Digital Camera with 18-105mm lens

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By default, this button locks the autofocus and exposure. It can be reconfigured to lock only one or the other, or other things. See the "f4: Assign AE-L/AF-L Button" section of the manual (page 200 in my copy). A fuller description of the focus lock is given in the "Focus Lock" section of the manual (page 57 in my copy).

If you need a manual you may download a copy from here.

Posted on Jan 04, 2013

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My Nikon Nikkor 18-135mm f/3.5-5.6G ED-IF AF-S for Digital SLR lens does not seem to auto focus well. Sometimes the lens will focus and unfocus and refocus constinely. Is this normal??


You did not say which camera body you are using, but you probably have three different auto-focus modes on you camera. You might be using the wrong one.

The modes are as follows:
AF-A Mode: Camera automatically selects single-servo autofocus when AF-A subject is stationary, continuous-servo autofocus when subject is moving. Shutter can only be released if camera is able to focus. AF-S Mode: For stationary subjects. Focus locks when shutter-release button AF-S is pressed halfway. Shutter can only be released when in-focus indicator is displayed.
AF-C Mode: For moving subjects. Camera focuses continuously while AF-C shutter-release button is pressed halfway. Photographs can be taken even when in-focus indicator is not displayed.

Dec 19, 2012 | Nikon Nikkor 18-135mm f/3.5-5.6G ED-IF...

1 Answer

How to get several focus points in a d7000 viewfinder?


Hi, On the D7000 you need to press the button on the side of the camera that's in the middle of the AF/M switch and then you use to switch to decide whether it's in 1 point autofocus (hence forth called AF), 9 point dynamic area AF, 21 point dynamic area AF, 39 point dynamic area AF, 3D tracking AF or auto area AF. If you need more help with switching AF modes let me know and I can help you out =)

May 16, 2011 | Nikon D7000 Digital Camera

1 Answer

Autofocus on 300mm 2.8 IS not working with 50D


Make sure the AF/MF mode button on the lens is set to AF.
What focusing mode do you have selected in the camera? Single Shot, AI focus or AI Servo? 
If Custom Function "C.Fn IV -1 Shutter button/AF-ON button" is set to option 2 or 3, the AF will start when you press the AF-ON button.
I hope this help you!
/Chris

Dec 28, 2008 | Canon Telephoto EF 300mm f/2.8L IS Image...

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Manual focus points 40D


Try checking C.Fn III, 3: AF point selection method. Yours might still be on option 2.

0: Normal - Works by pressing the AF Point button and then the Multi-controller.

1: Multi-controller direct - Press the multi-controller to directly select an AF point (without first having to press the AF Point button). Pressing the AF button reinstates all AF points for auto AF point selection.

2: Quick Control Dial direct - turn the Quick Control Dial to select AF points. In this mode, AF points will not be displayed on the LCD panel.

Jul 18, 2008 | Canon EOS 40D Digital Camera

1 Answer

What autofocus modes does the DiMAGE A200 employ?


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.

Sep 15, 2005 | Konica Minolta DiMAGE A200 Digital Camera

1 Answer

What autofocus modes does the DiMAGE A2 employ?


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.

Sep 15, 2005 | Konica Minolta DiMAGE A2 Digital Camera

1 Answer

What is the differences between Full-time AF and Continuous AF?


Full-time AF starts focusing when turned on and continues focusing without the shutter-release button pressed. This is usable to shorten the focusing time and to catch the moment. Continuous AF continues focusing while pressing the shutter release button partway down without focus lock.

Sep 13, 2005 | Konica Minolta DiMAGE Z3 Digital Camera

1 Answer

Focus modes


There are four focus modes: S-AF (Single auto focus), C-AF (Continuous auto focus), MF (Manual Focus), and S-AF/MF (Simultaneous mode). (SINGLE Auto Focus): Focusing is performed once when the shutter button is pressed halfway. C-AF (CONTINUOUS Auto Focus): The camera repeats focusing while the shutter button is pressed halfway. (MANUAL FOCUS): The function allows you to manually focus on any subject while looking through the viewfinder. SIMULTANEOUS USE of S-AF mode and MF mode: You can fine-adjust focus manually by turning the focus ring after AF is performed in the S-AF mode.

Sep 04, 2005 | Olympus EVOLT E-300 Digital Camera

1 Answer

AF mode


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

Sep 01, 2005 | Olympus Camedia C-3030 Zoom Digital Camera

1 Answer

AF mode


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

Sep 01, 2005 | Olympus C-3000 Zoom Digital Camera

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