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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 27 Jan 2015 (Tuesday) 23:13
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Canon 400mm 2.8 L IS AF hunt

 
Johnyjohn
Member
77 posts
Joined Mar 2010
     
Jan 27, 2015 23:13 |  #1

Hi,

I am using a used Canon 400mm 2.8 L IS (version I ) for last 3 years but have recently developed a problem. The AF start hunting and it keeps on going forward and backwards at one point but don't give a focus confirmation beef. It won't AF at all and I have to manually focus to take a photograph. After sometime AF would start working perfectly fine. It kept on happening for quite some weeks and now it is consistently giving that problem. Anyone else has gone through similar problem or any idea what the actual problem is so that I can have a fair idea before I send it to Canon for repair.




  
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Lenty007
Member
221 posts
Gallery: 5 photos
Likes: 21
Joined May 2006
Location: Ghent, Belgium
     
Jan 28, 2015 00:52 |  #2

Sounds like a contact point issue.
Try cleaning them before sending it to service.

Good luck!




  
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stargazer77517
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1,430 posts
Likes: 6
Joined Dec 2007
Location: Santa Fe Texas
     
Jan 30, 2015 10:38 |  #3

My 300 2.8 IS did that, had to send it in, was the AF assy, Canon replaced it. 250-300 range with shipping. By all means clean the contacts, make sure you have good light, and eliminate all of the possibilities before sending it in.


Davis (Fred)
My Gallery http://davisbourque.ze​nfolio.com/ (external link)

  
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rent
Senior Member
651 posts
Likes: 39
Joined Mar 2005
Location: Irvine, CA
     
Jan 30, 2015 15:54 |  #4

If this is happening with good contrasty target, then most likely the AF assembly will get replaced. Good luck! -alex


http://portfolio.alexj​iang.com (external link)

  
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Canon 400mm 2.8 L IS AF hunt
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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