Canon EOS-1D X AF at f/8 with the Kenko 1.4TC

[Childeric]

What I know is based on the comments of several others both on my blog and on the BPN post here: http://www.birdphotographers.net/forums/showthread.php/102647-1DX-Canon-800mm-f-5-6L-IS-Kenko-Teleplus-PRO-300-DGX-1-4x-AF-Teleconverter (I believe...)

Should point out that Phil on BPN stated, "I have a Kenko 1.4X Teleplus Pro 300 sitting in my dry box for years."  It's been mentioned in a couple of places that the f/8 AF on the 1D X seems to work only with the newest DGX version of the Kenko 1.4x, not with the older DG version (therefore possibly not with the even older vanilla Pro 300 version). 

So, perhaps there's some hope...

I have just tried again with the Kenko and 70-300 DO on my 1dX, and it still works, with firmware 1.06.

[Arthur Morris]

Well, I am confused about who said what   .

But when I went to the link it talked about the TC focusing with a Canon 2X or something like that.

[Childeric]

Yes. In order to get f/8, I tried two options.
a) 70-200 2,8 + Canon x2 + Kenko 1,4 pro 300
b) 70-300 DO 5,6 + Kenko 1,4 pro 300

Both did AF well, and not only whith the center point.

And the good news is that it still works with firmware 1.06

Unfortunately, I don't have an adequate lens to check whether it would also work at f/11

[Arthur Morris]

Should point out that Phil on BPN stated, "I have a Kenko 1.4X Teleplus Pro 300 sitting in my dry box for years."  It's been mentioned in a couple of places that the f/8 AF on the 1D X seems to work only with the newest DGX version of the Kenko 1.4x, not with the older DG version (therefore possibly not with the even older vanilla Pro 300 version). 

So, perhaps there's some hope...
[/quote]

Not really.  Folks with a 1DX with 1.06 who have just purchased the Kenko 1.4 are reporting a no-go--at least that is my best current understanding.  Also, on BPN, Martin Lord tested the Kenko 2X Teleplus Pro 300 with the 600 II; the results were dire--nowhere near sharp....

[Marsu42]

Does anyone know if it possible to save the firmware that is on the camera? 

AFAIK, it is not possie to save the currently-installed firmware.

Indeed - that's why the Magic Lantern devs always have to wait for the first firmware upgrade to get access to the code, they found no way to dump the current firmware out of the camera.

[Arthur Morris]

Indeed - that's why the Magic Lantern devs always have to wait for the first firmware upgrade to get access to the code, they found no way to dump the current firmware out of the camera.


Guess that I will not be sending my 1DX to Canon for repair....

[sparda79]

Result of test done by The Digital Picture.com
http://www.the-digital-picture.com/News/News-Post.aspx?News=3022

Autofocus Performance
    Canon EOS 1D X: AF worked and was fast with almost no hunting. However, metering was consistently off by +1 stop.
    Canon EOS 5D Mark III: AF worked and was fast with almost no hunting. Metering worked as expected.
    Canon EOS 5D Mark II: AF worked and was reasonably fast with a little hunting. Metering worked as expected.
    Canon EOS 7D: AF worked, but the camera had a hard time locking focus. Metering worked as expected.
    Canon EOS Rebel T4i / 650D: AF worked with a little hunting. Metering worked as expected.

So it does work with 5D3?
I'm a bit confused... 

[neuroanatomist]

Result of test done by The Digital Picture.com
http://www.the-digital-picture.com/News/News-Post.aspx?News=3022

Autofocus Performance
    Canon EOS 1D X: AF worked and was fast with almost no hunting. However, metering was consistently off by +1 stop.
    Canon EOS 5D Mark III: AF worked and was fast with almost no hunting. Metering worked as expected.
    Canon EOS 5D Mark II: AF worked and was reasonably fast with a little hunting. Metering worked as expected.
    Canon EOS 7D: AF worked, but the camera had a hard time locking focus. Metering worked as expected.
    Canon EOS Rebel T4i / 650D: AF worked with a little hunting. Metering worked as expected.

So it does work with 5D3?
I'm a bit confused... 

His tests were with a 400/5.6L and the camera firmware versions weren't stated - both lens and firmware could affect results.