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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 18 Jun 2010 (Friday) 19:56
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Will any teleconverter AF with Sigma 150-500

 
ducklabdad
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Jun 18, 2010 19:56 |  #1

Title says it all!!!!

Will any teleconverter AF with Sigma 150-500.

I have a Kenko 1.4 and also want a 2x

But will any of them autofocus, even if I buy the Sigma??


Just an "ole dog" trying to learn "new tricks"! helpful advice is always welcome!!

Canon 7d, Canon XS/ XSi,18-55, 14-40 L, 70-300, and Bigmos! my"work in progress" http://ducklabdad.smug​mug.com/ (external link)

  
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phreeky
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Jun 18, 2010 20:22 |  #2

If you buy a Kenko and tape the right pins the lens will try and AF. With that particular lens and a 1.4x though I'm guessing it will just AF end-to-end and not actually get a lock, except for maybe very extreme contrast objects in great light. 2x almost certain to not ever get a lock.




  
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artyman
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Jun 19, 2010 03:09 |  #3

I have both 1.4 and 2x Sigma TC's neither will AF, and the tape pin trick cust causes hunting, the 1.4 may possibly work in a high contrast well lit scenario, but to be honest it isn't worth it, just manual focus. It isn't that hard, heck we used to do it all the time in the old days :lol:


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millwright
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Jun 19, 2010 09:05 as a reply to  @ artyman's post |  #4

I purchased a 1.4X converter yesterday. Personally I think I wont be keeping it. The tripod support on the lens is in direct line with the focus ring making manual focus awkward


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ducklabdad
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Jun 19, 2010 14:16 |  #5

artyman wrote in post #10389157 (external link)
I have both 1.4 and 2x Sigma TC's neither will AF, and the tape pin trick cust causes hunting, the 1.4 may possibly work in a high contrast well lit scenario, but to be honest it isn't worth it, just manual focus. It isn't that hard, heck we used to do it all the time in the old days :lol:

I felt that was most likely the case but thought I would ask!! Ole dogs like myself have had to get "used to AF" Heck I still catch myself wanting to manually focus all the time!!!

Thanks for the replies!!


Just an "ole dog" trying to learn "new tricks"! helpful advice is always welcome!!

Canon 7d, Canon XS/ XSi,18-55, 14-40 L, 70-300, and Bigmos! my"work in progress" http://ducklabdad.smug​mug.com/ (external link)

  
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Will any teleconverter AF with Sigma 150-500
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