Question about Canon EOS 550D Rebel T2i Digital Camera

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My autofocus doesn't work on my EOS 550D

With the lens setting on AF I cannot autofocus when pressing shutter button halfway

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

jcdill
  • 121 Answers

SOURCE: 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.

Posted on Jan 11, 2009

  • 2 Answers

SOURCE: Canon 40D not firing

Try doing a reset in the camera tools somewhere, this fixed a similar problem I had.

Posted on Feb 06, 2009

  • 5 Answers

SOURCE: AF problem in CANON 350D

This is a problem with the mirror and the sensor. Have you out the camera in sensor clean mode? turning the camera to P then use the menu buttons to go to the second set of tool. clean sensor is there. You must have a good battery charge for it to work. take off the lens then hold the camera face down and activate the sensor. This did not work for me but this was one of the suggestions, if the mirror does lift back up when you put the camera in sensor clean mode then it is not the hinge that some are paying to be replaced. I took my camera and oddly enough turned it upside down in af mode in auto mode and it started shotting photos and focusing again. i did this about ten shots and when I put it back right side up everything worked fine! Try it and let me know.

Erikka Tiffani

Posted on Sep 08, 2009

  • 12 Answers

SOURCE: Canon EOS 5D Autofocus will not work.

ho.....ho...
I have this prob in my canon EOS kiss SLR.
CHECK THAT>>>>>>>
Hold the camera vertically.Switch on the AF and let the camera to auto focus.!!!!!!!!!!!!!!!!
Don't wondering....Check ur camera's sub mirror in the in side of the sub mirror.The spring that push back sub mirror from the main mirror is broken.......!
How to repair this? Follow this link....
http://www.facebook.com/home.php?#/album.php?aid=2042115&id=1359757176
bye..ec262d7.jpeg

Posted on Nov 04, 2009

  • 72 Answers

SOURCE: Canon lens locks when taking a picture.

Mirror lockup is probably enabled. You can disable it by going into Menu and then Custom Functions. Select Mirror lockup and disable it.

Posted on Jul 15, 2010

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1 Answer

Why when i press my shutter halfway it does not focus ?


Make sure the A-M switch on the lens is set to A for autofocus.

Also make sure the AE-L button is set to on (pg 144 of your manual) in your menu's otherwise the half-press of the shutter won't allow it to focus.

Aug 01, 2014 | Nikon D3200 24.2 MP CMOS Digital SLR with...

1 Answer

Nikon d5100 Blurry photos When I take photos of a party, at night, my photos are very blurry. How can I fix..


Use autofocus if you have a AF lens on it.

Usually you get a kit 18-55 AF lens that has a A/M switch on the side. The switch should be facing the A side so it's set on autofocus. Then you have 9 points on your viewfinder, those are the autofocus points. It should usually be set to center, because you usually want the object in center of your photo to not be blurry.
Remember to press the shutter button halfway and give some time for the autofocus to focus. Then you can press it all the way, you should have your photos nice and clear.

If you happen to have a manual focus lens, you should be watching through the viewfinder and turning the focus ring on the lens and determine if your object is in focus. It's hard at night, but get some practice at home when you have some more light so you get more familiar with the focus.

Dec 26, 2012 | Nikon D5100 Digital Camera

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...

1 Answer

All of a sudden every picture I take with the 55-200 zoom lens is blurry and slightly out of focus. Pictures with the 18-55 lens are still sharp. I have been using that 55-200 lens for years for sports...


Simplest answer is that you may have accidentally flipped the focus switch (A/M) on the lens to M. This turns off autofocus for that lens (which you might need to do if autofocus just can't resolve the image). Try turning it back to A.

Another possibility is that you're using an autofocus target different from the one you're expecting. The problem would be apparent regardless of lens choice, by being in focus in a different part of the image. You can press the arrow keys (while holding shutter release down halfway) to change AF targets, or change a menu setting to simply choose the closest target.

The shooting modes have no effect on focusing ability.

The camera would likely detect other focus-related problems (like servo failure).

May 09, 2011 | 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 a nikon d-40 is there a seeting on it that well let the cameras lens focus when you push the button half way down. I took picture but I had to manual focus I don't know if it the lens or this camera...


Any of the autofocus settings will attempt to focus when the shutter is pressed halfway. What lens are you using? If it doesn't have an internal focus meter, then the D40 won't autofocus with it no matter what. If it does have an internal motor, then check to make sure the lens is set on autofocus.

Check Custom Setting 12. If it's set on AF-On then the shutter button won't focus.

If this doesn't fix it, specify the lens and any other details.

Oct 09, 2009 | Nikon D40x Digital Camera

1 Answer

Automatic focus not working


The D40x only autofocuses with the latest AF-S (and old professional AF-I) lenses. Most traditional (screw-type) AF lenses from 1986 through today will not autofocus on the D40x. If your lens says "AF-S," you're fine.
Most lenses sold today for the D40x are AF-S, and so is the included 18-55mm kit lens. Many non-Nikon lenses from Tamron, Tokina, Quantaray, Sigma and anyone other than Nikon still won't autofocus on the D40x. Try before you buy, but honestly, there isn't much the included 18-55mm lens won't do.
Autofocus systems are fast, but not usually instantaneous. You have to hold the shutter down halfway as you compose the first shot so the AF system can focus and lock, and then the camera fires instantaneously when you press the shutter the rest of the way. See Preventing Shutter Delay for more.

Jul 14, 2009 | Nikon D40x Digital Camera

1 Answer

I can not get my canon eos rebel k2 focus on a


Autofocus is activated by pressing the shutter button halfway, be shure to have a EF lens in the camera, otherwise it won't make autofocus, put camera on full auto mode or "sports mode" (the running guy) and the focus settings on redictive AI Servo AF: Continuously tracks subject movement and achieves focus before the exposure starts.

Jul 10, 2009 | Canon Photography

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...

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

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