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Canon Extender EF 1.4x II lens combination advise
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Apr 11, 2018 07:45:00   #
dsmeltz Loc: Philadelphia
 
imagemeister wrote:
I never knew the T7i was capable of AF at f8 ! - Apparently, it has the same focus system as the 80D ! ?

I have the 80D and the 400 prime with 1.4X II. It is my understanding, that ( because of it's age) using the 400 prime can only give you center point AF - no matter which extender or body you use - so no advantage for the III series extender regarding AF with the 400 prime. There may be an optical advantage for using the III series extender - but is it $200-250 better than using a used II series - IMO NO.....but if spending the extra for the III series makes you sleep better at night - go for it

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I never knew the T7i was capable of AF at f8 ! - ... (show quote)


Don't remember where I saw it, but even Canon recommends the III extenders only for the newer lenses.

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Apr 11, 2018 17:46:35   #
imagemeister Loc: mid east Florida
 
dsmeltz wrote:
Don't remember where I saw it, but even Canon recommends the III extenders only for the newer lenses.



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Apr 11, 2018 17:49:09   #
imagemeister Loc: mid east Florida
 
FWIW, since a friend has the 1.4X III, I will do a test on the 400 prime AND the 100-400 II AND, the 100-400 I - using both the II and III 1.4X - should be interesting .....

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Apr 11, 2018 19:58:52   #
Notorious T.O.D. Loc: Harrisburg, North Carolina
 
These were taken a few weeks ago in Sarasota, Florida with the Canon 2x III Extender and 70-200 f/2.8 II. They are cropped quite a bit IIRC. Unfortunately I don't have a 1.4 Extender at this point but I am sure the III will do excellent based on other friends use of it.

Best,
Todd Ferguson

Karl Howells wrote:
Hello everyone this is my first attempt on UHPF was looking for any results/opinion with using a Canon 1.4 Extender EF 1.4x III with a Canon 400mm f5.6 and a sigma 18mm-300mm combination these are the two lens I walk around in the woods with. Some times the 400mm is just not large enough. Would spending the $400+ for the converter be worth it. I shoot with a T7i.
Thanks
Karl


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