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Please advise which 1.4x teleconverter to buy: Kenko, Tamron, or Sigma

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Vivid Color:
I have both the Canon 6D and the T1i and I recently bought the 70-300L for an upcoming African photo safari. My question is: should I buy a teleconverter and, if so, should I buy the Kenko 1.4 TC or some other non-Canon brand?  I know that there are other TCs on the market, such as Tamron's and Sigma's, yet I haven't been able to find much in direct comparisons to the Kenko. The comparisons generally seem to be between the 3rd party and Canon, which isn't helpful since the Canon TC won't work at all focal lengths on the 70-300L and therefore, I do not wish to buy it. (By the way, I posted a version of this question earlier, but did not receive any replies so I'm reposting it. I've also revised the subject as I realized the prior subject heading I used earlier today may have led you to think I was trying to start a theoretical debate when I'm really asking for your practical advice on what, if any, teleconverter I should buy.) Your comments about the various non-Canon brands of teleconverters and which might be best (if such a statement can even be made) will be greatly appreciated.

wickidwombat:
I have the kenko 1.4TC DXG300 its a good little unit and comparable to the much more expensive canon version with the added benefit that you can use it on other lenses its a great addition to a 100mm Macro lens for example.

Mt Spokane Photography:
Tamron TC's are mad by Kenko, but might not have the same electronics, but glass is the same.
So you are down to Sigma, Kenko, or Canon.
Do you have or need weather sealing?  Canon is the only one.  Otherwise, I'd go with Kenko.  I did buy and return a Kenko 1.4X TC, it locks up a 5D MK III with certain lenses, most noticably the 100mm L.  It only seems to do this with the MK III, I have no info about a 6D.
 
There is always the possibility that a TC will fail to be compatible with a future camera model, so factor that in as well.  There are a ton of older third party TC's that are not (fully compatible with newer cameras, meaning that they do not report information correctly, or do not work with certain lenses)

wickidwombat:

--- Quote from: Mt Spokane Photography on January 22, 2013, 09:38:47 PM --- I did buy and return a Kenko 1.4X TC, it locks up a 5D MK III with certain lenses, most noticably the 100mm L.   
--- End quote ---

strange my first mk3 (the one i had problems with did this, but its fine on the new body I'll have to test it out on the body i just bought  and see if there is anything there)

J.R.:

--- Quote from: wickidwombat on January 22, 2013, 10:28:32 PM ---
--- Quote from: Mt Spokane Photography on January 22, 2013, 09:38:47 PM --- I did buy and return a Kenko 1.4X TC, it locks up a 5D MK III with certain lenses, most noticably the 100mm L.   
--- End quote ---

strange my first mk3 (the one i had problems with did this, but its fine on the new body I'll have to test it out on the body i just bought  and see if there is anything there)

--- End quote ---

Please let me know your thoughts on this. I would be interested in this because I was planning to get a 1.4x kenko for using with the 5d3. I've heard that the kenko 1.4x somehow overrides the f/8 limitation for AF on the 5d3 while being cheaper.

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