Question about Canon 24-70mm f/2.8 Lens

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Auto focus trouble

Recently the 'auto focus' only focuses on the far left point in Manual & AV mode - but, strangely enough, works fine when in auto mode. Awhile back I got an error 05 - I think, or something like that - could it be related? What should I do to correct the problem?

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  • cyberkitty Dec 06, 2007

    That is EXACTLY What happened - it is so easy to accidently alter the settings - I didn't even know I did it. Hopefully thsi will help someone else ...... now, what about the freezing shutter button? It sticks.

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  • 24 Answers

Most likely, you have changed the AF point, which only takes effect in the creative modes (Manual, Av, Tv, P, etc)

There should be a button on your camera that has a grid like pattern above it, like
-
- - - - -
-

or so. press that, look through the viewfinder, and move the shutter or rear wheel, you should see the different AF points like up in red, and as you turn different ones will light up, and eventually all of them. also, you can look on the screen on top (or back, if its a rebel) and it will show you which ones are selected while in that mode, instead of looking through the viewfinder.

Posted on Dec 06, 2007

  • James Holleman
    James Holleman Dec 07, 2007

    Freezing shutter button -
    Perhaps something got in it? Try blowing it out with a can of compressed air, I also use a q-tip on my DSLR occasionally to clean out areas.

    If that doesn't fix it, maybe try taking it to a camera store to get cleaned.

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1 Answer

Hi there. i owned a Canon EOS 60D model camera. The problem is, its AF option is not working except Auto n 'C' modes. While i am trying to use it in M mode with AF, its not working but in auto mode an


Are you sure you did not put the AF/ MF switch in the wrong position? Although I don't think it would focus in Auto mode. In all other modes, are you sure you selected a (or more) focus point(s) in the centre of the frame?
When the selected focus point is on the side of the frame it won't focus on the parts you want it to focus. Then while pointing to the point you want the camera to focus, please press the shutter release button half and what till it focusses. Then press it the whole way down. Be aware the camera needs enough light to focus and certainly can't focus with a lens wit a min aperture of 6 or a larger number. On your 18-135 you can shoot at f16 because it will first focus on wide open and only close the aperture after you pressed the button.

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1 Answer

My shutter won't fire using 18-55 lens, either on Manual, P or Auto mode. It is set to AF. But when lens is set to MF, shutter fires. I tried switching to another lens and shutter is perfectly fine.


I could be that your lens isn't focusing. If the Auto focus can't find something to focus on the shutter won't fire. If you are shooting in low light sometimes it has trouble try shooting something that is well lit. also your auto focus point may be somewhere other than the center. there is a button on the top of your camera that looks like this [ ][ ] [ ] [ ]
More or less that will switch where your focus point is. If you look in the view finder and see a red dot when you push on the shutter button that is your focus point. push the above button until the red dot is in the centre. that may fix your problem.

Jul 26, 2011 | Canon EOS 450D Digital Camera with 18-55...

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Hi I bought my canon 1000d on september 2009 and a year later the autofocus doesnt want to work. In the viewfinder on the far right a number 9 has a green dot flashing next to it. Please help!! Ruthven...


The 9 you see is the maximum "burst" which is (pictures made in rapid succession) and is not an issue with your problem at this time the flashing green dot is the in focus confirmation light and it's good that you are seeing this as we will use it to remedy the problem.
Diagram
tri3mast_180.jpg

Manual focus switch
Diagram here
tri3mast_181.jpg
What I want you to do is put the AF-MF switch in the manual mode if it's already in manual mode then that was your problem switch to AF and go take some pictures. If it's in AF mode switch to MF make sure teh camera is on and look through the viewfinder at a subject say 15 feet (4.5 meters) away something that has contrast then turn the manual focus ring on the camera slowly until it appears to your ey that it's coming into focus when it's in focus the green light will come on solid, now you know what you are looking for focus an several different objects at different distances and focus manually. Now switch the lens over to AF (auto focus) and focus on the same thing but let the camera do the focusing What auto focus will not focus on in something with little or no contrast like water clear blue sky a painted wall mirror chrome glass and a few other things.
Here is another diagram to check make sure you are in the correct mode.
Diagram
tri3mast_182.jpg
Now for the focus point in the viewfinder make sure it's in the center position.
tri3mast_183.jpg
To adjust the focus point do this
tri3mast_184.jpg
Once you have the camera set to the center focus point and the correct AF mode (one shot) auto focus should return to your camera. Have fun Robert from London Ontario Canada

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1 Answer

Auto focus not working


Your Sigma 28-300mm doesn't have a HSM-motor as far as i know. When you switch it from MF to AF, you also have to disengage the manual focusing ring by pulling it towards the camera, or pushing it away from the camera. Using the AF without unlocking the manual focusing ring may damage the AF motor. 
I hope this helps, 
/Chris

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1 Answer

Canon AF Issues


Change from auto focus to manual focus or focus using only one focal square and change the setting to One Shot. You may need to shoot in Manual (M) mode though. Any of the "auto" modes will not let you.

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My Canon digital rebel will not autofocus correctly. My camera has 7 points autofocus, but it will only autofocus on the far right point. All other points are not used. I have had the camera for 14 months...


I had this problem awhile ago - you must have accidently adjusted the focal area - it is sooooo easy to do without realising it. Here is what I was told:
**************************

Most likely, you have changed the AF point, which only takes effect in the creative modes (Manual, Av, Tv, P, etc)

There should be a button on your camera that has a grid like pattern above it, like
-
- - - - -
-

or so. press that, look through the viewfinder, and move the shutter or rear wheel, you should see the different AF points like up in red, and as you turn different ones will light up, and eventually all of them. also, you can look on the screen on top (or back, if its a rebel) and it will show you which ones are selected while in that mode, instead of looking through the viewfinder.

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1 Answer

SC-D363


hmmm, the only thing i can think of is to try the easy Q mode and see if it works ok , when it is in easy Q mode it puts the video camera at a default setting and you cant change any of the menu options until you take it out of easy Q.

hope this helps

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1 Answer

Focus Problem


I have the C740, which I believe works very similarly if not identically. Unless you have the camera in full time auto focus, I don't believe it actually focuses on the subject until you've pressed the shutter button half way. Until then, the subject may look in focus in the viewfinder, but is not. When you fully depress the shutter in one motion (rather than pressing half way first), the camera will attempt to focus before it takes the shot. If you are not careful about camera movement, you may inadvertently be focusing on something other than what you intended. My camera (and it seems all digicams) has trouble focusing in low light, so you definitely want to use the half press in such situations. Even then, I don't always get the focus correct. Thank the digital Gods for instant feedback! Personally, I almost always use the half press method. To get the 740 in manual focus, you hold the "OK" button down until you see the viewfinder display a focusing scale. It takes a second or so. You should also see "MF" and "AF" designations in the lower left corner of the viewfinder when the scale displays. Use the left and right arrows to select the focus mode you want (i.e. MF or AF), then use the up and down arrows to adjust the focus distance. You'll notice that the area you are focusing on is enlarged when you use the up and down arrows.

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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.

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