100-400IS+1.4x(AF works!)

Started Jul 20, 2001 | Discussions thread
Shop cameras & lenses ▾
ForumParentFirstPrevious
Flat view
Fred Miranda Senior Member • Posts: 2,469
100-400IS+1.4x(AF works!)

Hi all,

I just got my 100-400IS back from service today and would like to share how to make auto focus work when using the 1.4x teleconverter.

I took the advice of making a few adjustments to the 1.4x teleconverter and now Auto-focus is possible.

It's very simple. Just place a small transparent piece of tape on the last 3 pins of the teleconverter. For more info see here:
http://www.dpreview.com/forums/read.asp?forum=1019&page=1&message=1297628

On the above link, it’s explained how to modify the Canon TC 1.4x, but I did the same with my Kenko 1.4x PRO 300 and it works like a charm.
I'm sure AF won't be as fast and hunt more but it's better than no AF.

I've tested inside my house tonight and it locked pretty quickly even in low light.

I don't see any side effects. If you want the TC to be like before, just remove the piece of tape. It's that simple.

Enjoy!
FRED
--Check my photo gallery at:
http://www.pbase.com/galleries/positiv

ForumParentFirstPrevious
Flat view
ForumParentFirstPrevious
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow