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Archive 2012 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!
  
 
Yakim Peled
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p.5 #1 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


PetKal wrote:
I am surprised that to the best of my knowledge nobody has confirmed that finding of A.Morris ? I can not do it because I ain't got the Kenko converter, and I do not need it either, certainly not for the 800L. I suspect a few other 1DX/800L owners are in the same boat as I.


It is now confirmed. It's relates to the DGX TC. Look here:

This makes sense based on my past experience with the Kenko Teleplus Pro DGX series. I own the Canon 2x II, the Kenko DGX 2X and the older DG version. My tests were with the Canon 70-200 f/4L USM Lens

The DG version would disable autofocus on my 7D (but not my 1D Mark II as you'd expect)
The DGX version would not disable autofocus on my 7D, would report the correct aperture to the camera and the EXIF data was correct (f/8) but required me to set EC to -2
I've come to believe that the DGX teleconverters do not disable autofocus but when used with some lenses designed to be used with teleconverters they require EC to be set to 1 or 2 stops depending on whether it's a 1.4x or 2x converter. It almost seems as though the camera double counts the teleconverter and over compensates in metering. This does not seem to be the case when used with my Canon 135 f/2 however.
When I used the DGX versions with lenses that are not designed to be used with teleconverters (My 85mm f/1.8 + Kenko 1.4x is really quite good) no EC is required to get correct metering.

My tests this morning with my 5D Mark III also showed no problem with autofocusing at f/8. I was using a Sigma 70-200 f/2.8 plus a 1.4x and 2x Kenko teleconverters. The number of points accessible to me was less than the regular 61 but the camera was able to autofocus quite accurately. The speed was not as good as just the lens itself. I also tried my Canon 135 f/2 with the Kenko 1.4x and it functioned exactly as you'd expect.


Happy shooting,
Yakim.



Sep 06, 2012 at 01:43 PM
big country
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p.5 #2 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


I can confirm it works w/ the 1dx +800 + Kenko DGX. i found the speed to be fairly fast and very accurate. the over exposure does present itself as a potential problem, but i am sure with proper time and testing compensation will become second nature.

so what does this do?

unless someone can figure out a way to get the 600 ii to AF w/ a 2x and 1dx, i'd say the 800 is the best option currently. but i guess its up to personal opinion.



Sep 07, 2012 at 12:40 AM
Pixel Perfect
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p.5 #3 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


big country wrote:
unless someone can figure out a way to get the 600 ii to AF w/ a 2x and 1dx, i'd say the 800 is the best option currently. but i guess its up to personal opinion.


Has anyone confirmed whether the 600 I/II + Kenko 1.4 DG(X) + Canon 1.4 II/III + 1D X can AF @f/8 ?




Sep 07, 2012 at 12:44 AM
jcolwell
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p.5 #4 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


big country wrote:
...unless someone can figure out a way to get the 600 ii to AF w/ a 2x and 1dx, i'd say the 800 is the best option currently. but i guess its up to personal opinion.


Based on my recent tests with the 1DX + 1.4x DG + 1.4x III + 500/4L IS (link below), the 600 II might work at 1200mm with the Kenko 1.4x DG(X) and Canon 1.4x III used together. Of course, the potential interaction between microprocessors in the Mk II lens, Mk III Extender, and 1DX might produce 'interesting' results.

http://www.fredmiranda.com/forum/topic/1146286



Sep 07, 2012 at 12:45 AM
big country
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p.5 #5 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


and i can confirm it works w/ my 5d iii as well.


Sep 07, 2012 at 12:50 AM
big country
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p.5 #6 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


pixel perfect, not sure about the 600 ii, but the 500 ii + kenko 1.4x DG Pro (not the dgx) + canon 1.4x iii will AF. it's very jittery and would eventually lock, but it did lock on.




Sep 07, 2012 at 12:51 AM
big country
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p.5 #7 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


5d iii and the 1dx will not focus w/ 500 ii + 1.4x iii + kenko dgx. Error 01 is displayed.


Sep 07, 2012 at 12:58 AM
Pixel Perfect
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p.5 #8 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


big country wrote:
5d iii and the 1dx will not focus w/ 500 ii + 1.4x iii + kenko dgx. Error 01 is displayed.


Well that's a bummer. I'm surprised it gives an error, rather than just not AF.



Sep 07, 2012 at 01:34 AM
big country
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p.5 #9 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


just tested the 70-300L and 100-400L, both will AF w/ the 1dx/5d iii + kenko DGX 1.4


Sep 07, 2012 at 02:19 AM
Pixel Perfect
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p.5 #10 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


big country wrote:
just tested the 70-300L and 100-400L, both will AF w/ the 1dx/5d iii + kenko DGX 1.4


Is the AF smooth or jerky, does it hunt. I'll grab a kenko DGX if the AF performance is reasonably good to use on my 100-400L. The 100-400L+ Canon 1.4x TC III works very well on my 1D IV as is good enough for bif's. I'd love to be able to use this combo on my 5D III.



Sep 07, 2012 at 03:15 AM
 

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big country
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p.5 #11 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


smooth, no hunting.


Sep 07, 2012 at 03:21 AM
Pixel Perfect
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p.5 #12 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


Cheers.




Sep 07, 2012 at 03:27 AM
big country
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p.5 #13 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


looks like the 2x dgx will AF w/ the 600 ii as well:

http://www.birdphotographers.net/forums/showthread.php/102716-Canon-1Dx-Kenko-2-0X-PRO-300-Teleconverter-DGX-Canon-EF-600mm-f-4L-IS-II

now the debate can go on!



Sep 07, 2012 at 03:35 AM
Lars Johnsson
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p.5 #14 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


big country wrote:
looks like the 2x dgx will AF w/ the 600 ii as well:

http://www.birdphotographers.net/forums/showthread.php/102716-Canon-1Dx-Kenko-2-0X-PRO-300-Teleconverter-DGX-Canon-EF-600mm-f-4L-IS-II

now the debate can go on!


Did you look at the IQ when he compared the Kenko 2X with the Canon 2X

Even if the AF worked. Nobody would use that combo with it's IQ. His pics with the Kenko are so bad and blurred that it's a joke



Sep 07, 2012 at 07:34 AM
big country
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p.5 #15 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


i just saw that and agree.


Sep 07, 2012 at 12:38 PM
Yakim Peled
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p.5 #16 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


Lars Johnsson wrote:
Did you look at the IQ when he compared the Kenko 2X with the Canon 2X

Even if the AF worked. Nobody would use that combo with it's IQ. His pics with the Kenko are so bad and blurred that it's a joke


+1

If I'd need a 2X TX I'd take the Canon Mk III even if that means losing AF. However, I suppose the differences in the 1.4X area will be much smaller.

Happy shooting,
Yakim.



Sep 07, 2012 at 05:36 PM
big country
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p.5 #17 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


Not sure if people are keeping up w bpn/birdsasart sites.

Tim Kuhn reported that the kenko dgx won't af w his 1dx that has the updated firmware. I haven't updated mine yet. I had multiple 5d iii's and updated the firmware on one and all af'd w
The combo.

Just a heads up.



Sep 07, 2012 at 10:07 PM
Pixel Perfect
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p.5 #18 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


I can verify that 5D III + 100-400L + Kenko Pro 300 DG does not AF. So it appears only DGX version is worth trying on 1D X and 5D III.


Sep 08, 2012 at 08:15 AM
jcolwell
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p.5 #19 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


Pixel Perfect wrote:
I can verify that 5D III + 100-400L + Kenko Pro 300 DG does not AF. So it appears only DGX version is worth trying on 1D X and 5D III.


With the contacts taped, the 100-400L + Kenko 1.4x DG on 1DX has smooth and accurate AF, the focus confirmation 'finder flash' is active, and the 1DX reports apertures of from f/4.5 at 100mm to f/5.6 at 400mm.

http://www.fredmiranda.com/forum/topic/1146286/0#10937346



Sep 08, 2012 at 11:43 AM
ragebot
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p.5 #20 · 800mm f/5.6 + 1D-X + 1.4x Extender = Apparently It Can AF!


Just a little thread drift here.

Back when I was just a lad I bought a Sigma 300-800/5.6 because at the time the longest lens Canon made that I could realistically buy was the 600.

Because it is raining now I was only able to do this test in my living room. I put three Kenko ETs (for a total of 68mm) between my 1dx and the Sigmonster. AF worked in M but hunted more in A and never would settle down. When I captured an image in A using MF it was over exposed but an EC of -1 seemed to produce a nice histogram.

I used LV at 10X to MF and the image seemed crisper than the AF image, but that might just be better exposure.

Once it clears up (as all Florida bird shooters like me know if you don't like the weather just wait a little while and it will change) I will do more tests using my old (as in over five years) Kenko 1.4 TC, my Canon I 1.4 TC (taped and untaped) and the bare Sigmonster.

If anyone has suggestions on how to do these tests I am all ears. Normally I would take a five foot carpenter's rule, set it at a 45 degree angle and shoot at the 2.5 foot mark, and then shoot AF and MF; and then repeat this with a dollar bill. I am also considering adding three more ETs for a total of 136mm.



Sep 08, 2012 at 01:59 PM
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