Canon Extender EF 2x III

3 years 10 months ago #684238 by keith1955
Does anyone own this , I do dolphin photos and plan a safari adventure when lockdown done.
I have canon 90d and use the latest 100-400 , the one with the rotating zoom not the older push pull.
I see conflicting reports that if you want to be lazy and use auto instead of manual then this extender stops the auto focus working. ?


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3 years 10 months ago - 3 years 10 months ago #684276 by 7Wishes
There's more than a good chance that you'll lose the ability to auto focus using the X2 extender and possibly even the 1.4 extender. You'll also lose 2 stops of light, f/5.6 will become (equivalent) to f/11 when using the X2 extender and you'll lose 1 stop of light when using the 1.4 extender. You'll also have to take into consideration a fall off in image quality, more so when used with zooms and using the X2 extender. Edit, assuming you have version 2 of the 100-400mm lens, AF is possible with your camera only using the 1.4 extender with 27 point coverage, all other compatible lens other than the 200-400mm are limited to centre point focusing only. 
Taken with a 5D MK IV - Canon 100-400mm MK II - 1.4 extender III - 1/400 - f/9 - ISO 1600. Auto focus is retained with the 5D MK IV. 
 


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