topic 400 prime on 6d body not working when attached to Kenko c-AF 2x teleplus mc4. Why? in EF & RF Lenses

400 prime on 6d body not working when attached to Kenko c-AF 2x teleplus mc4. Why?

Lucashots — Sun, 19 Jun 2016 12:45:27 GMT

See subject. Works on all other ef lenses in bag? I get total shutdown of camera, no windows, functions at all

Re: 400 prime on 6d body not working when attached to Kenko c-AF 2x teleplus mc4. Why?

ebiggs1 — Sun, 19 Jun 2016 13:54:52 GMT

No it won't work on the 6D. I don't believe but since I don't have a 6D maybe someone else has an idea. You can try to tape the pins on the converter and that might let it work.

2X tele converters are a poor idea in the first place. IMHO, of course.

Re: 400 prime on 6d body not working when attached to Kenko c-AF 2x teleplus mc4. Why?

diverhank — Sun, 19 Jun 2016 18:28:12 GMT

I'm not familiar with the Kenko 2X but if it reports the settings to the camera, the camera won't allow it because the 400mm f/5.6 (i assume this is the one you have?) with the 2X will have the minimum aperture of f/11. The 6D cannot autofocus beyond f/5.6 so this is possibly why it won't work.

As Ebiggs said, you can try taping the pins (google for procedure) to fool the camera in thinking it's still f/5.6. I also recommend against using the 2X on such a lens...the result will not be optimum in both Autofocus and image quality.

Re: 400 prime on 6d body not working when attached to Kenko c-AF 2x teleplus mc4. Why?

Lucashots — Mon, 20 Jun 2016 02:24:46 GMT

Thank you!