I like this lens and used to use it a lot but have had to stop using it because it cannot auto focus any more.
The lens simply drives back and forth hunting for a focus point. It sometimes stops hunting allowing me to take a picture but this is usually blurred.
If I switch it to Manual Focus and turn the focus ring by hand, the camera detects when the picture is in focus correctly.
I have tried cleaning the inner and outer lenses as well as the contacts on the camera bod and the lens itself.
I know it is a lens problem because if I use one of my other lenses, I get autofocus instantly.
Canon 28-135mm f/3.5-5.6 EF IS USM AF - SEEMS TO HAVE LOST ITS ABILITY TO FOCUS - DOES OKAY MANUALLY, BUT AUTO HAS LOST IT'S SPARK - NO MORE ONE HANDED SHOTS! DOES NOT SEEK A FOCAL POINT BY GOING TO AND FRO - DOES IT NEED CLEAINING, CALIBRATION, OR WHAT?
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If the camera is used you may have a problem with the seller. Before jumping into conclusions however read your manual for your solution or simply search youtube for a help video. Hopefully this helped.
Are you using an auto-focus m4/3 lens? I have about 20 lenses for this camera and only 1 of them is an auto-focus m4/3 lens. I have an adapter so I can use my 4/3 lenses on it in auto-focus mode along with other various mounts (including cctv) that do not support auto-focus. So if you are using a non-auto-focus lens, you will need to manually focus the pictures.
If you are certain it is an auto-focus lens, are you sure you have it set to auto-focus?
What settings do you have your camera set to (aperature mostly is what I'd like to know)? Try adjusting your aperature to be small (to increase your DOF).
Also what lens are you using and what is your focal distance? It could be your lens has a larger or shallower focal distance than what you are trying to achieve (like a macro lens doesn't work that great for landscape photography or a telephoto lens doesn't work great for macro photography).
Last thought: is your lens or sensor dirty? A dirty lens can cause focusing issues if it is REALLY dirty and a dirty sensor can too (sensor is a bigger pain to clean. I strongly recommend taking it to the pros as they scratch really easily). Dirty lenses can be cleaned with a blower and a lint free cloth and rubbing alcohol if those 2 things don't clear it out.
On the front of the camera body, below the lens release button you should find a two position switch labeled "AF" & "M" This is the "Auto Focus - Manual" selector switch. Make sure the selector is set to "AF" for auto focusing.
Your lens may have a similar focus selector switch on its barrel. There are two types of switches used - depending on the lens. The first is labeled "M/A" and "M" The "M/A" position indicates it is in "Auto Focus" mode with a "Manual" focus over ride capability. You can simply twist the focus ring to change the focus to a point other than that chosen by the camera's auto focus system. The "M" position is Manual Focus mode. No focusing operations will be performed by the D80 auto focus system - focusing must be done by the photographer.
The second type has "A" & "M" positions. These represent Auto and Manual focus. The difference between this type switch and the "A/M & "M" switch is that when in "A", the camera will no allow the focus to be changed manually. There will be opposition to twisting the focus ring in the position. Forcing it will likely result in damage. The selector switch must be changed to "M" to change the focus.
If either switch is set to manual, the auto focus system will be disabled, so it is very important to have them both set to "A" or "A/M".
there is couple of possibilities like wise when you zoom lens manualy and can you heard the hard noise then could be AF unit itself faulty. AF unit gear is gone.
could be AF shaft broken thats why not focusing
could be AF Flex broken thats why not focusing
for that please bring to canon service center
I see this same problem occuring all over the internet on Canon lenses. Autofocus not working any longer. For some stupid reason the lense will lock up and quit autofocus while other lenses will work fine. A light pull on the lense focus ring away from the camera body will give a noticable pop or click which unlocks the jammed lense. Try it if you are having troubles with your autofocus. This is a very common problem and worth giving it a try.
Usually this is a lens fault as the focusing gear is all in the lens. Clicking sounds as if a rear pinion has cracked. It's not uncomon in the 'prosumer' level lenses where plastic gears are used a lot.
It's just possible the fault is which the auto-manual switch. This usually has a mechanical clutch coupled to it which physically disconnects the gearbox from the focusing ring, as well as operating a switch to tell the camera to turn off the AF system.
There is a bar that transfers the movement of the focusing ring to the motor in the back of the lens. If it jumps out of the plastic slot, you will hear the AF motor turn, but it will never focus in either auto or manual mode. You will have to buy a new lens, get the lens repaired (probably more expensive than buying a kit lens), or partially take the lens apart and re-seat the bar.
Here is a link showing how to fix it: http://forums.dpreview.com/forums/read.asp?forum=1022&message=17650836
I did it successfully in about an hour with a set of jeweler's Phillips screwdrivers, tweezers and a strong lamp. You MUST be comfortable delecate parts and tiny screws. Then again, you have nothing to lose if you are going to buy a replacement lens.