Canon autofocus lens on Sony A7ii with adaptor

old bloke · 6 Apr 2016

Hello all you lovely Canon experts out there I wonder if you can help me, I have just purchased a Canon 400mm F 5.6 EF lens and a 1.4 extender to use with an adaptor on my Sony A7II , the autofocus works fine with the lens alone,
but not with the extender as you would expect, some years ago I owned a Canon 10D and a Canon 100-400 lens and a 1.4 extender which I was able to get to work just fine using a little trick with a bit of tape covering a couple of the connecting pins
I'd like to try this again but can not remember which pins to cover, I'd appreciate any help I can get please.

Cheers Bob

Oliver Pohlmann · 6 Apr 2016

Edit - Ignore me. I didn't read your whole post.

owenb · 6 Apr 2016

old bloke said:
Hello all you lovely Canon experts out there I wonder if you can help me, I have just purchased a Canon 400mm F 5.6 EF lens and a 1.4 extender to use with an adaptor on my Sony A7II , the autofocus works fine with the lens alone,
but not with the extender as you would expect, some years ago I owned a Canon 10D and a Canon 100-400 lens and a 1.4 extender which I was able to get to work just fine using a little trick with a bit of tape covering a couple of the connecting pins
I'd like to try this again but can not remember which pins to cover, I'd appreciate any help I can get please.

Cheers Bob

at what aperture are you trying to autofocus and what adapter do you own?

troutfisher · 6 Apr 2016

From memory you tape the last two pins on the RHS when the contacts are facing you.
Best of luck , I got it to work with a 100-400 on a 5Dc but not on a 7D, it does seem a bit hit and miss

old bloke · 6 Apr 2016

troutfisher said:
From memory you tape the last two pins on the RHS when the contacts are facing you.
Best of luck , I got it to work with a 100-400 on a 5Dc but not on a 7D, it does seem a bit hit and miss

Thanks Chris I'll give it a try, if it doesn't work manual focus is no great hardship using focus peaking

old bloke · 6 Apr 2016

owenb said:
at what aperture are you trying to autofocus and what adapter do you own?

Hi thanks for your response I am using a Canon extender EF 1.4x II at maximum aperture. Commlite adaptor

owenb · 6 Apr 2016

okedokie I have a metabones adapter for the sony a7ii it works with 150-600 sigma but is very very slow to focus over f8 not sure on commlite though

old bloke · 6 Apr 2016

old bloke said:
Thanks Chris I'll give it a try, if it doesn't work manual focus is no great hardship using focus peaking

Hi again, just given it a try and its a no go, worth a try but as I said before it's not a problem.

Thanks again.

Chunkey Monkey · 7 Apr 2016

I have 7D and 6D and just need to tape up the first 3 pins for it to work

http://www.michaelfurtman.com/taping_the_pins.htm

old bloke · 7 Apr 2016

mark2002 said:
I have 7D and 6D and just need to tape up the first 3 pins for it to work

http://www.michaelfurtman.com/taping_the_pins.htm

Thank you Mark, this webpage looks very familiar I'm pretty sure it's where I saw this in the first place,
Ive done the mod and it works a treat, it's a nice bright morning so I've been having a play, adjusted the steady shot setting on the camera to 600mm and am amazed I can actually hand hold it,
Family commitments mean I can't get out today but hopefully tomorrow.
Once again thank you very much for your help.