100 - 400L IS USM AF HELP

[BRASH]

I have an EF 100 - 400L IS USM lens and 1.4 Mk II TC, which when fitted, knocks out the lenses auto focus. I knew this was the case when I bought them but I've heard there is a way to 'tape the contacts,' so the AF works. Does anybody know how this is done and which of the contacts need to be taped.

 

[scraggs]

Not sure if it's the same for the Canon but on the Kenko its the 3 farthest pins on the left.

 

[MattEg]

Have a look at the contacts on your lens and TC.
You'll notice one of them has three extra contacts to the other.
The extra three are the ones to tape.

HTH

 

[Gary]

http://www.fencecheck.com/forums/index.php/topic,1183.0.html

 

[BRASH]

Perfect. Pins taped and AF working. Cheers for the tips.

 

[dsb]

What is the reason behind stopping the auto focus? there must be a reason to it.

 

[IanC_UK]

What is the reason behind stopping the auto focus? there must be a reason to it.

With the TC fitted the max aperture of the lens drops to F8 non 1 series bodies will only AF to F5.6 the 1 series will AF to F8 its a limitation in the Bodies AF system.

 

[Byker28i]

Very useful having just obtained one of these lenses.

Strange one has to do this as Canon list the 1.4 and 2x convertors as compatible with this lens.