Camera Question: AF with converters

Chris Hawes · #1 (**permalink**) 02-02-2007, 07:02 PM

Hi everyone,

This is a question for one of the many technically gifted photographers out there!

Is it possible to get the auto focus to work when using a Canon EF 100-400IS lens with an EF 1.4 Mk II converter? I have heard a few rumours that it is possible but I have no idea how.

Any help would be much appreciated.

Cheers,

Chris

Ps - if it makes a difference, the camera is a 20D

Blackdog · #2 (**permalink**) 02-02-2007, 07:12 PM

Ah ha! I know this one

(but only because Graham - GLSammy told me)

Have a look at this link: D30/D60 Tips and Techniques

I've tried it on mine and it works

Chris Hawes · #3 (**permalink**) 02-02-2007, 07:20 PM

Blackdog, you have just improved the quality of my life by a factor of 1.4!

Thanks you very much - you are a star!

matt_xyz · #4 (**permalink**) 02-02-2007, 07:29 PM

different people seem to report very different levels of success with this technique. It works terribly on my 400mm prime, the AF hunts even in good light. My lens is basically MF only with the TC fitted. But others say it works well.

Matt

Boddie · #5 (**permalink**) 02-02-2007, 07:29 PM

It works great for me too

Chris Hawes · #6 (**permalink**) 02-02-2007, 07:34 PM

I'm going to be testing it out tomorrow so fingers crossed it works!. If not it's back to MF or getting closer!

glsammy · #7 (**permalink**) 02-02-2007, 07:47 PM

Quote:

Originally Posted by matt_xyz

different people seem to report very different levels of success with this technique. It works terribly on my 400mm prime, the AF hunts even in good light. My lens is basically MF only with the TC fitted. But others say it works well.

Matt

That's disappointing Matt. I know it works well on Andrews 100-400, so I assumed it would work just as well if not better on the 400mm prime.

matt_xyz · #8 (**permalink**) 02-02-2007, 07:52 PM

I'm wondering whether it's because I went for a Kenko TC, supposed to be optically very similar but a quarter of the price of the Canon TC. I went for this because I'd already been told that the Canon doesn't work great so didn't want to risk £200. Or maybe TCs work better on the 100-400 lens than the 400 prime, I don't see why that would be though. Having said that, someone recently told me he only uses his Canon TC on MF on both his 100-400 and 400 prime because of AF hunting. One day I'll have to try a Canon TC and see if it's any better.

Matt

Blackdog · #9 (**permalink**) 02-02-2007, 07:57 PM

My 1.4 is a Canon. I once bought a cheapo Jessops t/c and soon decided that matched lenses and t/c's would be a good idea after all

glsammy · #10 (**permalink**) 02-02-2007, 08:05 PM

Quote:

Originally Posted by matt_xyz

I'm wondering whether it's because I went for a Kenko TC, supposed to be optically very similar but a quarter of the price of the Canon TC. I went for this because I'd already been told that the Canon doesn't work great so didn't want to risk £200. Or maybe TCs work better on the 100-400 lens than the 400 prime, I don't see why that would be though. Having said that, someone recently told me he only uses his Canon TC on MF on both his 100-400 and 400 prime because of AF hunting. One day I'll have to try a Canon TC and see if it's any better.

Matt

The one I had with my Bigma was also a Kenko. I couldn't get on at all with it, every shot was very soft at best. Maybe I'd be better trying a sigma one? If I could get one to give me half decent results, I'd have no need to buy another lens!