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jw9077
Joined: 29 Jan 2009 Posts: 5
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Posted: Thu Jan 29, 2009 12:12 pm Post subject: Help for my new N 24-85 on Canon 20D |
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I got a new N 24-85 modified from Conurus, and I put on my Canon 20D.
Originally it is very smoothly, but after I shoot around 20 pictures, the auto focus function seems something wrong. It could not focus. I try to power off, remove lens,... It doesn't work. Does it have reset function? |
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jnswickard

Joined: 22 May 2007 Posts: 47 Location: Dana Point
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Posted: Thu Jan 29, 2009 2:39 pm Post subject: |
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You probably have the aperture set on the wrong f-stop on the lens. It should be set on the minimum aperture (ie 16/22) for autofocus. Aperture for shooting purposes is set on the canon body like all canon lenses.
Give this a try.
Jack |
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jrn813

Joined: 26 Feb 2007 Posts: 90 Location: Cotulla, Texas
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Posted: Fri Jan 30, 2009 2:43 am Post subject: |
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I Never Change The Aperture On The Lens. Setting The Lens To Minmum Aperture Gives You MF.
Set It Wide Open And Leave It, Unless You Want MF.... If That Does Not Work
Yoiu Might Try This Advice From Bo-Ming To Another Member....
Jon,
Thank you very much for your input!
It may not be the camera after all, but the lens - in which case, this trick is sometimes helpful:
Manually focus to infinity, and continue to turn past infinity for one turn.
Manually focus to 0.5m, and continue to turn beyond 0.5m for one turn.
This procedure would help if the lubricant in the lens has dried up and cause the AF to stop working.
_________________
I am a bird and I uncovered the N-mount and EF-mount communication protocols! _________________ jrn813 (John R) |
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doctorb

Joined: 21 Jul 2008 Posts: 101 Location: North Carolina
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Posted: Fri Jan 30, 2009 11:47 am Post subject: |
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Don't know what other people's experience has been, but the more I used the 24-85, the better the AF worked.
Probably most of these lenses were sitting around doing nothing for quite some time before they were converted.
It's neat that Bo-Ming has developed the technology to resurrect a great piece of photographic equipment. These fine lenses are now going to have a long and productive new life in the hands of those fortunate enough to get one.
(Hate to sound like a broken record, but if you like the 24-85, you will be doing back flips over the 100 Makro and 17-35).
Dr. B. |
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conurus Site Admin

Joined: 15 Aug 2006 Posts: 795 Location: Vancouver, Canada
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Posted: Fri Jan 30, 2009 1:29 pm Post subject: |
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If you would let me know the serial number of the lens by PM, that would be great. Thanks! _________________ I am a bird and I uncovered the E, EF and N-mount communication protocols! |
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jw9077
Joined: 29 Jan 2009 Posts: 5
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Posted: Sat Jan 31, 2009 2:31 am Post subject: |
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conurus wrote: | If you would let me know the serial number of the lens by PM, that would be great. Thanks! |
Hi! I try all way what I could, but it still don't work. The lens S/N is 12709903. Is it the 20D issue? I just have one EOS camera, so I couldn't try it on another body. It is work when I mount another Canon lens on 20D. |
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jw9077
Joined: 29 Jan 2009 Posts: 5
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Posted: Sat Jan 31, 2009 3:08 am Post subject: |
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Hi Thanks! I use the following procedure and resolve the problem.
Manually focus to infinity, and continue to turn past infinity for one turn.
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jrn813 wrote: | I Never Change The Aperture On The Lens. Setting The Lens To Minmum Aperture Gives You MF.
Set It Wide Open And Leave It, Unless You Want MF.... If That Does Not Work
Yoiu Might Try This Advice From Bo-Ming To Another Member....
Jon,
Thank you very much for your input!
It may not be the camera after all, but the lens - in which case, this trick is sometimes helpful:
Manually focus to infinity, and continue to turn past infinity for one turn.
Manually focus to 0.5m, and continue to turn beyond 0.5m for one turn.
This procedure would help if the lubricant in the lens has dried up and cause the AF to stop working.
_________________
I am a bird and I uncovered the N-mount and EF-mount communication protocols! |
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asimo
Joined: 08 Sep 2007 Posts: 13
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Posted: Mon Feb 02, 2009 3:38 am Post subject: |
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I am having exact same issue , mine is 12698091 |
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jw9077
Joined: 29 Jan 2009 Posts: 5
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Posted: Sun Feb 22, 2009 5:51 am Post subject: |
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I purchse new 5D mark II, and 24-85 work fine on this new body.
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jw9077 wrote: | Hi Thanks! I use the following procedure and resolve the problem.
Manually focus to infinity, and continue to turn past infinity for one turn.
-------------------------------------
jrn813 wrote: | I Never Change The Aperture On The Lens. Setting The Lens To Minmum Aperture Gives You MF.
Set It Wide Open And Leave It, Unless You Want MF.... If That Does Not Work
Yoiu Might Try This Advice From Bo-Ming To Another Member....
Jon,
Thank you very much for your input!
It may not be the camera after all, but the lens - in which case, this trick is sometimes helpful:
Manually focus to infinity, and continue to turn past infinity for one turn.
Manually focus to 0.5m, and continue to turn beyond 0.5m for one turn.
This procedure would help if the lubricant in the lens has dried up and cause the AF to stop working.
_________________
I am a bird and I uncovered the N-mount and EF-mount communication protocols! |
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frank
Joined: 05 Feb 2008 Posts: 17 Location: Boston, USA
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Posted: Wed Sep 16, 2009 4:49 pm Post subject: PM messages stays inside the outbox |
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Hi Bo-Ming,
I have sent two messages to you recently.
However, I found that those messages keep staying inside the outbox instead of the sentbox.
Does this mean that the reciever can not see them until they are moved into the sentbox?
Thanks,
Frank |
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conurus Site Admin

Joined: 15 Aug 2006 Posts: 795 Location: Vancouver, Canada
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Posted: Wed Sep 16, 2009 11:17 pm Post subject: |
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Recently I have received a large number of enquiries and I apologize for not getting to your messages soon enough. They stay in your outbox until I check my PM. In reality I never check my PM but route all of them to my email. In any case I will attend to your enquires very shortly. |
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frank
Joined: 05 Feb 2008 Posts: 17 Location: Boston, USA
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Posted: Thu Sep 17, 2009 2:46 pm Post subject: PM messages stays inside the outbox |
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Thanks Bo-Ming.
One of the my message is regarding to my converted 24-85 lens.
The lens stopped auto-focusing. Only doing the MF all the times no matter what the aperture ring I set.
Do you have any clue about this? Anything I can do for the resetting to make the AF work again?
Thanks,
Frank |
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conurus Site Admin

Joined: 15 Aug 2006 Posts: 795 Location: Vancouver, Canada
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Posted: Thu Sep 17, 2009 5:02 pm Post subject: |
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Frank,
Your 24-85 is covered by our 1-year ultrasonic motor warranty. We will replace the ultrasonic motor of your lens free of charge. (That is even though our lens mount conversion has nothing to do with it.) However, if there is a more serious issue such as an internal mechanical problem, it would not be covered but referred to Contax Japan. Please send your lens back to us using our address label
http://en.conurus.com/coneos_address.pdf
and we will work on it. Thanks! _________________ I am a bird and I uncovered the E, EF and N-mount communication protocols! |
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conurus Site Admin

Joined: 15 Aug 2006 Posts: 795 Location: Vancouver, Canada
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frank
Joined: 05 Feb 2008 Posts: 17 Location: Boston, USA
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Posted: Wed Sep 23, 2009 1:28 pm Post subject: |
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Hi Bo-Ming,
Sorry for my delayed reply for your suggestion as I was away for the whole weekend and was able try the method last night.
Yes, I have tried to read your method and not quit sure what is the meaning of "one turn", is it one scale of the ring, or one whole circle?
I have tried the either way and the lens still not doing the AF.
Any suggestions?
Thanks,
Frank |
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