My Canon was several times for repair as I experience problems with focusing. In AF mode not all the red lights get activated, should they???In Manual focus there is no beep or any light and it doesn't focus at all. I removed the lens and then put it back, but it didn't help. This problem has been since I bought the camera-it was a demo. Is there hope. Iva
Not all of the lights are lit when in AF mode, there are different ways for AF to work and you should refer to your manual to understand how to set up/understand what it is doing. Camera manufacturers seem to make their customers believe that their camera is easy to use, and yet fill the thing with all of the technical stuff/gadgets which make it very difficult for a beginner to understand. Hope this is of some use!
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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.
It's attempting to tell you that AF has failed. I'd expect low light, low contrast, reflective subject like a mirror or chrome. A solid colour wall with no contrast will also cause a AF failure. Auto Focus relies on contrast. Switching to manual mode shuts off the system and you can take a picture with nothing in focus.
That is a custom function of the camera that can be change back to default with ease. While in one of the creative zones press the menu button and navigate to the 5th and final tab on the top right.
This is the Setup menu 2. In this menu, select “Custom Functions (C. Fn)” . This will open a submenu of numbered options. Select #04 and set it to 0: the default AF/AE lock on a half depress of the shutter.
That should get your camera back to the expected auto focus with the shutter button.
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 - - - - - - -
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.
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.