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Archive 2015 · A doubt about the 100-400 II + III 1.4X extender.

  
 
Stealth_117
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p.1 #1 · p.1 #1 · A doubt about the 100-400 II + III 1.4X extender.


I am a future owner of a 100-400 II that I would used with an extender 1.4x III.
I would like to know if on my SLR 6D and 7D the central point of autofocus will continue to operate, like the MKII 7D, 5D MKIII and all 1 series.
Thanks,
Fulvio.



Jan 19, 2015 at 03:06 PM
EB-1
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p.1 #2 · p.1 #2 · A doubt about the 100-400 II + III 1.4X extender.


No, they don't naturally AF at f/8. You will have to fool the camera/TC.

EBH



Jan 19, 2015 at 03:10 PM
kabraxcis
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p.1 #3 · p.1 #3 · A doubt about the 100-400 II + III 1.4X extender.


Stealth_117 wrote:
I am a future owner of a 100-400 II that I would used with an extender 1.4x III.
I would like to know if on my SLR 6D and 7D the central point of autofocus will continue to operate, like the MKII 7D, 5D MKIII and all 1 series.
Thanks,
Fulvio.


Actually the 6d and 7d both do not AF at f8

so the answer is no, regardless of TC type



Jan 19, 2015 at 03:13 PM
Stealth_117
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p.1 #4 · p.1 #4 · A doubt about the 100-400 II + III 1.4X extender.


Really bad news. Thanks for the answers.


Jan 19, 2015 at 03:17 PM
gwaww
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p.1 #5 · p.1 #5 · A doubt about the 100-400 II + III 1.4X extender.


I believe it may focus with some after market TC's. I could use my canon 100-400 with my Tamron TC on the original 7D.


Jan 19, 2015 at 03:29 PM
scalesusa
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p.1 #6 · p.1 #6 · A doubt about the 100-400 II + III 1.4X extender.


They will both AF fine with a 1.4XIII TC, but you need to tape the contacts to disable communication between the camera and the TC. AF will be much slower.

There is a ton of online information about taping the contacts.

The current Kenko TC's will AF without taping contacts, but they will lockup the camera with certain lenses unless you turn the AFMA off.



Jan 19, 2015 at 09:11 PM
Stealth_117
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p.1 #7 · p.1 #7 · A doubt about the 100-400 II + III 1.4X extender.


Thanks to all.


Jan 20, 2015 at 01:10 PM
ashley138
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p.1 #8 · p.1 #8 · A doubt about the 100-400 II + III 1.4X extender.


I believe contrast focus will still work (focus in LiveView) but I think it will probably be really slow with that small of a max aperture


Jan 20, 2015 at 06:41 PM
Tom_W
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p.1 #9 · p.1 #9 · A doubt about the 100-400 II + III 1.4X extender.


ashley138 wrote:
I believe contrast focus will still work (focus in LiveView) but I think it will probably be really slow with that small of a max aperture


It does on the 70d, contrast AF. I would not try to track a bird in flight with contrast AF though. Even the improved live view system on the 70D isn't quite that fast.

But, for static subjects off a tripod, I think it can work.



Jan 20, 2015 at 10:19 PM
gschlact
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p.1 #10 · p.1 #10 · A doubt about the 100-400 II + III 1.4X extender.


Taping of pins does not guarantee the PD AF will work. There are physical dependencies regarding the aperture and actual Af system.


Jan 21, 2015 at 12:46 AM
jean-paul land
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p.1 #11 · p.1 #11 · A doubt about the 100-400 II + III 1.4X extender.


I just rec'd my 100-400 v2 yesterday. On my 70D with the 100-400 v1, AF with the taped Kenko 1.4 Teleplus Pro 300 was terrible. With the v2, it's just a little less terrible. Nevertheless, the images are vastly superior to the v1 combo.




Jan 21, 2015 at 09:24 AM





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