sigma 500 f4.5 dg +kenko dgx pro1.4×

Started Mar 19, 2013 | Discussions thread
MikeFromMesa
Senior MemberPosts: 2,849
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Re: sigma 500 f4.5 dg +kenko dgx pro1.4×
In reply to stefanoromei, Mar 27, 2013

stefanoromei wrote:

there is someone using this combo on canon?

I am not but it seems clear that you have several choices:

1) Tape the pins. The 5D3 will focus at f/8 without any issue if it does not know that is the aperture. I have absolutely no problem focusing with my Canon 100-400 and my Kenko non-reporting 1.4 TC since the TC does not report the reduction in aperture. The camera, thinking it is focusing at 4.5 (or 5.6) just focuses - quickly and accurately. Taping the pins will solve this problem.

2) Use a non-reporting TC. As above, if the camera does not know, it will focus. The 5D3 has a marvelous focusing system.

3) Wait for Canon's firmware update which, I believe, is supposed to be released next month. It will remove the software block that prevents focusing at f/8. Then you should be able to focus with your reporting TC.

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