Suggestions re lens converters.

I have exchanged a 1.4x third party converter for a Canon EF 2X III and am very disappointed with it. With the previous converter I was able to use AF with my 100-400L, but this Canon converter refuses to co-operate!

Should I swop it for a third-party x2? It would be a lot cheaper than the Canon!

Richard

The difference is 1.4x teleconverter only loses one stop of light, the 2x loses two. Once you've slapped the 2x on the 100-400, it will be manual focus only- the camera won't try it since the maximum aperture is smaller than required for autofocus (you'd be at F/11).

Stick with the 1.4 if you want to use a teleconverter on the 100-400- the 2x are useful for the big fast primes, and even then they degrade image quality quite a bit more than the 1.4x.

if you want AF on a 100-400L with a converter, you should've never bought a 2X of any brand

DreDaze wrote in post #17525558
if you want AF on a 100-400L with a converter, you should've never bought a 2X of any brand

Indeed. I would, at least, have tried typing '100-400 2x AF' into Google first.

While that's not what I wanted to read, I appreciate the answers.

I assume this would equally be true with a third-party x2?

Lowner wrote in post #17526233
While that's not what I wanted to read, I appreciate the answers.

I assume this would equally be true with a third-party x2?

Correct.

There is an option though not a perfect one. You can tape the pins so that the TC will not report to the body. AF will still work though other things come into play like the amount of light, the steadiness of the image and such. But in good conditions with a nice high contrast edge to focus on, AF will work.

http://www.michaelfurt​man.com/taping_the_pin​s.htm

The Kenko TC seems to be the best one to use when taping pins, but, the 100-400 is less reliable than the 400/5.6. The AF will hunt in all but the best light and will turn the 1-4 into a slow unreliable lens, and, having seen your pics I don't think you'd be happy with it.