Question about Canon Rebel XT / EOS 350D Digital Camera

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Autofocus jumps around and often will not settle on the correct setting

My XT can't seem to find the correct autofocus point anymore. When I hold the shutter release down halfway, the camera tries to focus, but jumps in and out of focus over and over, until I get the flashing green circle in the lower right corner of the viewfinder (the camera can't figure out the correct focus point), or it decides it has focused correctly, but it's wrong. I can see various different AF point lights flashing in the viewfinder when it does find a focus point. Can anyone help with this?

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  • Quasam Mar 01, 2008

    I have the exact same problem.

  • lusmu Mar 02, 2008

    When my camera is set on auto focus, it will jump around like his and try to focus and then i get the blinking green light and it will not take a picture. Does not matter what lens i have on it. It will still take pictures on manual settings, but will do nothing when on auto.

  • crumbb Apr 21, 2008

    I'm using the Cannon lens that came with the camera body. Doing a hard spin of the zoom wheel seems to make it work for a random period of time.

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I found what my problem was. Someone had been tinkering iside the camera, and a ribbon cable was not seated correctly.

Posted on Apr 21, 2008

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Some generic lenses have this issue (always hunting/seeking). If you're not using a Canon lens, try using a Canon lens and see if the problem persists.

Posted on Apr 21, 2008

  • John Ayres Apr 22, 2008

    The "kit" Canon 18-55mm lens that usually comes with the Digital Rebel isn't one of Canon's best lenses. You may have a defective lens. .....John

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What i do is usually put it onto manual focus then back to auto focus, what it may be is that you are using the wrong lens for your subject :/

Posted on Mar 22, 2008

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1 Answer

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...

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Autofocus problem


Does this problem still exist when you have the shutter pressed halfway down?

Regards,
Worldvet

Jun 15, 2008 | Nikon D40x Digital Camera

1 Answer

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

A Single AF (default setting)

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

B Full-time AF

The camera focuses continuously until the shutter-release button is pressed down

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

while the camera focuses.

Sep 28, 2010 | Nikon Coolpix S3000 Digital Camera

1 Answer

I have an Olumpus d-535 camera that does not Autofocus well.


Try pushing the Shutter halfway down until you get a green "go" indication, and take the pic. This forces the camera to focus, and is something you often have to do with these point and shoot automatic focusing cameras.

Mar 13, 2010 | Cameras

1 Answer

Auto focus problem


If you set the camera on "manual", it assumes you focused manually and allows you to press the shutter without having to stop half-way. Check your settings.

Oct 07, 2009 | Canon Rebel XT / EOS 350D Digital Camera

1 Answer

Coolpix camera is making buzzing noises when on


It's the autofocus trying to focus. Focus on something and press the shutter halfway down and nnow you can point wherever without autofocus trying to refocus

Jul 23, 2009 | Nikon Coolpix S210 Digital Camera

1 Answer

Canon Rbl XT out of focus in viewfndr when shutter half way down


Hello,
It's possible that the reason the "pictures turn out fairly good" is that your f-stop is set high enough that even though the image isn't properly focused, you have enough depth-of-field to bring your subject into "near focus". Does your lens try to focus back and forth when you half-press the shutter? If not, double check that the lens is in autofocus and not manual focus. You can also try cleaning the contacts between the lens and camera. Take the lens off, and then one-at-a-time clean the contacts on both the lens and the camera, using a clean pencil eraser. Gently rub the contacts. Be sure to hold the item upside down so that the eraser debris falls on to the table, not into the camera body or lens!

If none of this helps the autofocus may have become damaged and you need to have the lens and camera looked at by Canon Repair.

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5 Answers

Nikon d40 autofocus


Look on the left side of the lens. Make sure the button is on A for auto focus and not M for manual. OR not stuck in the middle. Hopefully that will solve the problem.

Jul 11, 2008 | Nikon D40x Digital Camera

1 Answer

Cannot focus on a particular subject


If the camera is having a difficult time auto-focusing, you can try the FOCUS LOCK feature. This feature allows you to focus on another subject roughly the same distance from you and then move the camera back to the intended subject and take the picture without losing focus. First, turn the camera on and locate the Autofocus Target Mark in the center of the LCD. The AF Target Mark resembles an open and close bracket [ ]. Position this AF Target Mark on a subject roughly the same distance away as the subject the camera is having trouble focusing on. Press the shutter button halfway enabling the lens to focus. While holding the shutter button halfway down, aim the camera at the original subject and press the shutter button all the way down.

Sep 01, 2005 | Olympus D-630 Zoom Digital Camera

1 Answer

Focus


If the camera is having a difficult time auto-focusing you can try the FOCUS LOCK feature. This feature allows you to focus on another subject roughly the same distance from you and then move the camera back to the intended subject and take the picture without losing focus. First, turn the camera on and locate the Autofocus Target Mark in the center of the LCD. The AF Target Mark resembles an open and close bracket [ ]. Position this AF Target Mark on a subject roughly the same distance away as the subject the camera is having trouble focusing on. Press the shutter button halfway enabling the lens to focus. While holding the shutter button halfway down, aim the camera at the original subject and press the shutter button all the way down.

Aug 31, 2005 | Olympus Camedia D-435 Digital Camera

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