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400/4 and New Canon TCs Problem

 
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doctorb



Joined: 21 Jul 2008
Posts: 101
Location: North Carolina

PostPosted: Sun Dec 26, 2010 1:55 am    Post subject: 400/4 and New Canon TCs Problem Reply with quote

Just purchased a new Canon TC1.4 III. It appears incompatible with the Contax N 400/4. Error message says lens not communicating with camera (5D Mk II). I do not believe I had this problem with the earlier TC II.

Is this a software issue? Any fix available so that I can use the Canon TC 1.4 MkIII with the 400 lens?
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conurus
Site Admin


Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Mon Dec 27, 2010 11:24 am    Post subject: Reply with quote

Thank you for your problem report. Canon tele-converters used to have no active circuitry inside, but that changed with 1.4x III and 2x III, and there is now a microprocessor inside the tele-converter.

I will order a 1.4x III and see if I can work around this problem. In the meantime, if you wouldn't mind trying this experiment, that would be great. If you would tape up the teleconverter contact pins (i.e. the 3 extra electrical contacts) of your lens, please let us know if the error goes away. Thank you very much!
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doctorb



Joined: 21 Jul 2008
Posts: 101
Location: North Carolina

PostPosted: Mon Dec 27, 2010 4:00 pm    Post subject: Reply with quote

Taped the three extra contact pins and it did not correct the problem.
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conurus
Site Admin


Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Mon Dec 27, 2010 7:58 pm    Post subject: Reply with quote

Thank you. I just placed an order with Adorama and will work on this as soon as I get my EF 1.4x III.
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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

PostPosted: Sun Jan 09, 2011 9:25 am    Post subject: Reply with quote

Received the tele-converter from Adorama on Friday.

I am happy to report that a resolution is available as conurus firmware update version 3.17. Affected customers please send your converted lens back for a firmware update. Thanks!
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