Canon 2x and 1.4x mk3 extenders

[wopbv4]

Well...darn, now I need a 12mm extension tube...  If it works the same, that means the 1.4xIII-EF12-2xIII combo behind a 600/4 will give me 1680mm that reports as f/8 and will AF on the 1D X. 

I tried :
1DX, 2XIII, 12mm Kenko, 1XIII, 70-200 F2.8 L II @200mm.

Manual focus works, but autofocus ( single spot AF in the center) does NOT. I tried to focus on infinity, 10 m, 5 m, none of them focussed.

I might be doing something wrong?

[wopbv4]

sorry for the typo
should be:
1DX, 2XIII, 12mm Kenko, 1.4XIII, 70-200 F2.8 L II @200mm.

[ietion]

as far as i've tried, autofocus on extenders only works on primes. Might not apply to all, but I think that's your problem. Try them with a prime.

[neuroanatomist]

The OP had the 1.4x closest to the camera.

[wopbv4]

Ok, I missed that.
I tried with 1DX, 1.4XIII, 12mm Kenko, 2XIII, 70-200 F2.8 L II @200mm, still no joy.

Even if I manually focus first and then press the shutter button halfway, it still hunts and is unable to acquire focus.

It is night in Oz, but I switched all the studio lights on (=a lot) and sufficient distance around 10 m (=manual focus works) at a high contrast subject, it still hunts like mad.


I will try in daylight tomorrow morning, but I have little hope.

Anyway, it works in manual mode, so thanks for the the tip !!


Hope this informs

Ben

[Alex]

Thats really strange because mine works fine... I tried it earlier today in the garden with random stuff and it was a little slow but still worked... Have you tried it on Live view?

[wopbv4]

Hi Alex,

indeed in liveview it works, all be it very slow and the target needs to have a fair bit of contrast.
Anyway, from now on , I will carry a 12 mm extension tube, so I have the option to combine the extenders.

Thanks everybody !

Ben

[Alex]

Glad I have finally contributed something worthwhile to this forum

[stensth]

I tried this setup as well, but it didn`t work for me.

1dx, 1,4tc, but I only had the 25mm avaible, 2,0 tc and 400/2,8 IS II

I didn`t focus to infinity nor did autofocus work as well.

Any suggestion on custom settings?

[ForumMuppet]

I tried this last night with my 70-200 f/2.8 IS II and it worked! The camera saw the setup as an f/5.6 lens and that allowed me to select all 61 AF points on my 5DIII. I was indoors at night so there was not a lot of light, so there was a problem locking focus, but I am not sure if that was because of trying to use 560mm of lens in my living room, or the low light. But the AF motor was searching! I will be trying this again outdoors this weekend and also with my new 300 f/2.8 IS II that I should be getting Thursday!

[Etienne]

I tried this setup as well, but it didn`t work for me.

1dx, 1,4tc, but I only had the 25mm avaible, 2,0 tc and 400/2,8 IS II

I didn`t focus to infinity nor did autofocus work as well.

Any suggestion on custom settings?

25mm extension tube is probably pushing it too far.
They have had success with the 12mm only

[Etienne]

Here's an extension tube combo I've used to good effect:

5DIII - 2X converter - 12mm extension tube - 50mm f/1.4   

This combo creates a pretty decent macro lens
Tip: focus the 50mm close before attaching to the extension tube
Set aperture at least f/8 to f/16

BTW - works well with the EOS-M+adapter as well... gains 1.6x crop factor

[TexPhoto]

Very cool, but let me ask this:  Is this combo getting you better results than just cropping?  I'm not saying it is not, but that is the thing about a teleconverter, or combination of converters is it has to outperform just cropping the image.

If you shoot the moon with just the 2.0X and then crop, is there less less detail?

[tpatana]

Nice, maybe I should try with my 1200/5.6.

[Skulker]

Very cool, but let me ask this:  Is this combo getting you better results than just cropping?  I'm not saying it is not, but that is the thing about a teleconverter, or combination of converters is it has to outperform just cropping the image.

If you shoot the moon with just the 2.0X and then crop, is there less less detail?

After reading the original post I gave it a try just for fun. And yes the results were really quite good and better than cropping.