1.4x extender II with 24-70 2.8

Has anyone tried using a 24-70 with the 1.4 extender? Does it work good. The

reason for asking is I would prefer to get the 24-70 2.8 rather than the 24-105

4.0. The 24-70 with the extender would essentially give the same coverage at the

long end when needed.

Larry, I'm pretty certain that the 24-70 is not compatible with either of Canon's telextenders. It only works with tele primes over 135mm and the 70-200 series and 100-400 zooms AFAIK. Good luck.

I tried it myself in September. It won't physically fit. Sorry.

Just another note, if you were to put the extender on (which you can't anyway) It would become a 34-98 f/4 anyway. So basically what I'm saying is: The 24-105 f/4 IS is the better choice. Also, if you are mounting it on a 1.6x body, you get the extension anyway. Good luck with it:)

Thats what I had in mind for the 5D and 24/70 to compansate for the 1.6 crop but the guy at B&H told me it would not work and even if it did it would make the AF focus slower I need to make the AF focus faster if anything.

I have just tested my 24-70 with the Kenko 1.4x Teleplus Pro 300. The autofocus is as fast as without the TC. Since the 24-70 is big, long and heavy, adding the TC will make the lens even longer and thus more difficult to hold the camera, lens and TC combination. I think the 24-105 is much better if you want longer reach.

3rd party tc will work, the Canon ones won't due to the front elements extending beyond end of tc housing.

Why not get the 100mm f/2 instead of trying to use a TC? You'd have a lot more flexibility with the fast aperture, and much better performance in every way than the 24-105 at the long end (less distortion, more resolution, less CA, less vignetting...).