70-200 Is
It is an exceptional lens. I use mine mainly for shooting motocross and other sporting events. I'm not much of a fan of the 2x TC, especially when used with a zoom lens. I ended up selling my 2x for a 1.4x and I havn't looked back since, the degradation of the image quality is pretty noticable with the 2x but hardly at all with the 1.4. I'v also experienced an error message (erroe 99 I think it was, a bad contacts error) when I shoot with this lens on my 20D vertically, after some investigation I'v discovered that it is not uncommon at all for this particular combo to do that, even when the contacts are spotless. It doesn't happen very often but it can be quite frustrating. All in all though I think you will be thrilled, I'll never sell mine.
Cheers,
Russ
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