I use the X2 (mk. I) with a 200/2.8L. If I'm careful, I can get good results that look fine when projected. Images are noticably softer when usiung the converter with the 70-200/2.8L. Autofocus slows down, but still works (effective aperture is 5.6). I usually try to shoot at an effective aperture of f8 or even f11.
Geoff Doane
> I haven't yet found a lens that works really well with the 2x.From: Henning Wulff <[EMAIL PROTECTED]> Subject: Re: EOS Canon 2x II Extender EF - Autofocus
No autofocus with any body. The 1.4x works with some bodies, and is also acceptable (for some stuff, to my taste) optically. I've tried the 2x with manual focussing, but couldn't get anything sharp enough.
I don't use it on the 100-400 any more unless desperate, and only rarely on the 70-200 IS. Strangely, it does work quite reasonably on the back of an old 400/5.6 Nikkor from the 70's with an Nikon/EOS adapter. As I don't have any other longer lenses at the moment, that is the combo I use when I want 800mm. Stopping down one stop improves things slightly, just like the lens by itself. No AF, but I wouldn't have that anyway.
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