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Question about Canon Digital Rebel XT / EOS 350D Digital Camera with EF-S 17-85mm IS Lens

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AUTO FOCUS CAMERA WONT LOCK ON IN AUTOFOCUS MODE ON MOVING SUBJECTS

Posted by donald clark on

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Anonymous

I had the same problem and I thought it was the lense. The problem was the camera focus set up. You can spot focus on one of 5 points or take an average reading of all points. If you don't have the center point set you will take out of focus photos most of the time. Read your manual about AF and how to set it. It is easy to bump the zone focus button and rotate the dial by accident. John

Posted on Sep 28, 2007

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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.
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I have a brand new nikon coolpix s3000. it's on full-time auto focus. Any ideas?

You can change this in the menu while in shooting mode. This is from page 48 of the manual:

Choose how the camera focuses.

A (auto) M d (Shooting menu) M I Autofocus mode

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The camera focuses when the shutter-release button is pressed halfway.

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halfway. Use with moving subjects. The sound of lens drive movement will be heard

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Auto focus tracking

All autofocus points, and Focus mode set to Servo.
Check out digitalphotographyschool.com's forums, they are excellent sources for this type of info. And you can join a community of other DSLR users like yourself.
Nov 28, 2009 • Cameras
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My Fuji S5100 now fails to properly focus. I have

1 ensure that your camera is not set in Macro mode test by taking a picture of a subject very close up ie. 10 - 15 cm if the image is in focus then you may be set in macro mode.
2 if lens is removeable ensure it is fitted properly. remove the lens and refit ensureing the connectors are clean.
3 ensure the switch on the lens or camera is set to AF for auto focus.
4 suspect autofocus sensor is defective if you try to focus on subjects which are close and far away and you do not hear to camera re-setting the focus then it is in manual focus or the focus sensor may be defective or in need of adjustment.

5 recommend specialist have a look at this problem.


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The lock that's around the 4-way button that moves the AF point will stop it from moving. The AF switch (says C,S,M) on the body below the lens release button gets knocked to manual and turns off the AF
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It is just a possibility but you may have overrode the auto focus. If you accidentally move the focussing ring it disables the auto focus.
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Focus

The camera uses a precise auto focus mechanism, but under the conditions and with the subjects described below the auto focus function may not work well. Subjects moving at high speed Very shiny subjects such as a mirror or car body Extremely low contrast subjects (such as subjects dressed in the same color as the background, etc.) When there are objects in front of or behind the subject (such as an animal in a cage or a person in front of a tree) Subjects with little reflection, such as hair or fur Subjects with no solidity, such as smoke or flames Subjects viewed through glass In addition, the focus is set on the center of the frame, so if the subject is not at the center (when shooting two people standing side by side, for example), the focus is adjusted on the background and the desired subject (the two people) may be out of focus. In such cases, do the following: Point the camera so that one of the persons is at the center of the viewfinder. Half-press the shutter button. (The focus is locked on the person.) Holding the shutter button in the half-pressed position, reposition the camera to achieve the desired composition. Take the photo. If the focus cannot be adjusted, it is locked to infinity (1.5 meters when using the flash).
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Focusing Difficulties

1. Typical problem subjects for autofocus 1) Very low-contrast subjects 2) Overlapping nearby and distant objects 3) Very bright subjects in the center 4) Subjects moving very fast 5) Subjects through glass Focus on an object that is at the same distance as the desired subject, apply Focus Lock, and then recompose the picture. Or set the lens focus mode switch to (or), and focus manually. (Manual focus is only possible with cameras providing this feature.) 2. Attempting to take pictures out of the camera's shooting distance: When taking pictures out of the camera's shooting distance, the subject will be out of focus. The shooting distance differs from each camera model. Please check the specifications of your camera in the instruction manual to determine the shooting distance.
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Focusing Difficulties

1. Typical problem subjects for autofocus 1) Very low-contrast subjects 2) Overlapping nearby and distant objects 3) Very bright subjects in the center 4) Subjects moving very fast 5) Subjects through glass Focus on an object that is at the same distance as the desired subject, apply Focus Lock, and then recompose the picture. Or set the lens focus mode switch to (or), and focus manually. (Manual focus is only possible with cameras providing this feature.) 2. Attempting to take pictures out of the camera's shooting distance: When taking pictures out of the camera's shooting distance, the subject will be out of focus. The shooting distance differs from each camera model. Please check the specifications of your camera in the instruction manual to determine the shooting distance.
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