On Mon, 27 Feb 2006 17:00:50 +0100, "Gerard Maas" <[EMAIL PROTECTED]>
wrote/replied to:

>As we are speaking about 400mm, has anybody tried the 70-200 L F/4
>with a 2xTC ?  Yes, I know it will be a slow beast at f/8 and you'll
>have to use the tape-the-contacts trick to force the AF to work, but
>is it optically any good?
>I've been considering upgrading to the 70-200L IS 2.8 for this reason,
>but I've doubts regarding the weight of this beast in my mini trekker.
>
>I'll be going to Thailand in April and would like some tele
>capabilities for sure :-)   (any general photographic recommendations
>for Thailand are more than welcome :-)

I have found that any 2X extender really takes away from the sharpness. In fact,
I found it basically useless. A 1.4X on the other hand is liveable. I would not
suggest that combo, or any other combo including a 2X.

You'll be much better off with a 1.4X and some cropping.

-- 
Jim Davis, Nature Photography:
  http://naturephoto.easternbeaver.com/
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