Question about Canon Normal EF 50mm f/1.4 USM Autofocus Lens

1 Answer

The Auto focus just stop working

I have Canon 50mm f/1.4 USM. It just stop working in AF mode for auto focusing. It is hardly used

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  • Anonymous May 21, 2009

    I have the exact same problem. For a litle while it started working again, the suddenly stoped working for good. There is a small movement on the focus ring, but it is unable to move the lens into focus.

  • idieA May 21, 2009

    I have the same problem. The auto focus sporadically stops working. My lens is under one year old. I am wondering who to go to for service? Do I have to send the lens back to Canon?

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  • 480 Answers

Hey Sammymalone,
This lens should have a 1 year manufacturers warranty on it, and if my guess that the USM motor is burned out is true I would have it serviced by an authorized service technician. Before you do this though I would try cleaning the lens contacts to make sure it is communicating with the camera body. I of course am going on the assumption that you have tried other lenses on the camera body to make sure the problem is the lens and not the body. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

Posted on May 29, 2008

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Posted on Jan 02, 2017

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1 Answer

My lens stopped working in Auto Focus mode. I can take a picture in manual but I can't seem to focus clearly. I prefer using auto focus for my everyday pictures, but the lens will not work. I am sure it...


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

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It sounds like the circuit board flex has gone bad, It folds back and forth when you zoom the lens, And needs to be replaced by a repair shop and readjusted. Tony

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Canon EF 75-300mm f/4-5.6 III USM Lens Auto focus motor keep working back and forth but lense is not able to stop on focus right. Had eror 01 also sometime with manual focus.


If your AF motor is hunting then the lens probably needs to be looked at. I wouldn't recommend this as something to do at home so you will need to either find a repair shop if it is out of warranty or return it to Canon if it is in warranty.

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Canon 75-300mm USM III, was initially working fine


Hi
you seemed to have a problem with the camera (auto-focus) mode. I suggest you try shooting in manual focus only but consider taking it to a canon service outlet for proper checks and service as a long-term solution.

Apr 04, 2017 | Canon Zoom Telephoto EF 75-300mm f/4.0-5.6...

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Auto focus does not work on the 135mm


hi i am sagha a camera repairer from mumbai, i have gone through such problems much oftenly,in your case i think it is the internal problem with the flex board inside the lens which is multitwisted on metal plate after prolonged use becomes stiff & brittle and creates hairline cracks on the pcb which in turn breaks the tiny tracks & leads to malfunction at 135 mm.

May 26, 2009 | Canon 28-135mm f/3.5-5.6 EF IS USM AF Lens

2 Answers

Canon ef 50mm 1.4 can't focus <1m


If the AF motor is still alive + spinning, this should be fixable without any replacement parts.
Following URLs might be useful:
http://www.flickr.com/groups/canon_50mm/discuss/72157603775874649/
And this one - detailed instructions how to dismantle this lens and fix the issue similar to yours.
http://www.fotomozaic.ro/artikel.php?idstory=225&s=1

Hope this helps - good luck!
Raf

Jan 30, 2009 | Canon Normal EF 50mm f/1.4 USM Autofocus...

1 Answer

Canon 17-85 Lens with Rebel XTI Camera


This is because the camera will not expose a picture until the auto focus is locked. If you are shooting in dimly lit conditions, the AF might have a hard time obtaining a lock. Using the flash as auto focus assistance many time helps in this condition.
Another reason might be that you try to focus on even surfaces with low contrast. The auto focus work by sensing contrast. Even surfaces, such as a white wall or the sky, have very little contrast, therefore the auto focus will not be able to obtain a lock. The solution here is to point the AF sensor at something with more contrast, such as an eye, a pole, or basicly anything that have edges/lines.
I hope this help you!
/Chris

Jul 09, 2008 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens

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