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1.4x extender II with 24-70 2.8

Larry Rech , Nov 01, 2006; 07:29 p.m.

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.


Steve Torelli , Nov 01, 2006; 07:46 p.m.

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.

Leopold Stotch , Nov 01, 2006; 07:47 p.m.

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

Leopold Stotch , Nov 01, 2006; 08:01 p.m.

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:)

Jim Moloney , Nov 01, 2006; 08:15 p.m.

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.

Philip To , Nov 01, 2006; 11:20 p.m.

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.

Mike Smith , Nov 02, 2006; 03:49 a.m.

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

Mark U , Nov 02, 2006; 04:28 a.m.

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...).

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