Question about Canon EOS 400D / Rebel XTi Digital Camera with 18-55mm Lens

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Auto focus No autofocus in AV or TV, only in the automatic modes

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Hey robinhood123,
The camera being in AV or TV mode should not effect the auto focus system, and if the auto focus is working in the automatic modes that implies to me the problem is with the camera body and not the lens. I would try resetting the camera to the factory default settings by following the directions on page 100 of your camera manual. If you no longer have a copy of your manual I have included a link to it below. If resetting the camera doesn't work I would have the camera looked at by an authorized service technician. I hope this helps!

http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=215&modelid=14256#DownloadDetailAct

Sincerely,
Allan
Go Ahead. Use Us.

Posted on Jun 26, 2008

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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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My canon eos 400d will not autofocus in creative settings.


Hey mate,

I've been having the same problem. It annoyed me during a day out once.

Set the camera in one of the Creative Modes.
-> Then go to Menu (the button on the left of the screen)
-> Setup 2 (thats the furthest menu on the right)
-> Custom Functions (3rd option down)
-> Go to function 4 and change it to "0: AF/AE LOCK"

Hope that helps mate :)

Cheers
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AI should be focusing. You really can't change many settings when you are shooting in auto mode. Is the lens in AF mode?

I'm sure you have long since returned from vacation!

Hope this helps!

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Auto-focus isn't working


Try checking your settings for the type of shot you are taking and for the type of focus......
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Also, you could try updating the firmware in your camera. You do this through the Nikon website.

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