I've put a dandelion chip (4th gen) on my Samyang 500mm f/6.3. I shoot a Canon 6D by the way. So, that's cool now I've set the chip to return f/6.3 and I can get a correctly exposed LiveView, EXIF shows 500mm, that's nice. But the main thing I was looking for, the AF-confirm, is still not working.

As anyone tried this chip on this specific lens and successfully set the back/front focus correction?


1 Answer 1


If you programmed the chip to return the correct maximum aperture of f/6.3, Autofocus on an EOS 6D is disabled, and therefore also AF-Confirm does not work. The AF-Sensors on this camera need at least a maximum Aperture of f/5.6 to work.

You can look at this question and it's answer for more detailed information.

  • To compensate (if you think AF will actually work reliably with f/6.3 in a bright situation), you could set a fake aperture of f/5.6 and then use exposure compensation to adjust to the right exposure. Then the camera would meter 'correctly' and on a bright situation you may get AF confirmation as well.
    – rfusca
    Mar 13, 2014 at 1:09
  • Guys, sorry for the long time of reply. I only saw your comments at the moment. Anyway thanks for your inputs, I'll try this ASAP and tell you what :). Cheers!
    – user186258
    May 23, 2014 at 12:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.