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      07-12-2011, 05:31 PM   #39
Drives: '04 330i ZHP
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Originally Posted by Chewy734 View Post
well, if you decide on the 100-400mm f/4L IS, apparently Canon is shipping me one that I'll be returning to them... so, if you want one, it's yours.
Originally Posted by UdubBadger View Post
oh nice, how much?

wait... they make a 100-400 F4 IS? or did you mean the 70-200?
Now that I think about it, if I do a 70-200 2.8 on my 40D (1.6x crop ratio) thats a 280mm equivalent still shooting f/2.8. Then if I do a 1.4xTC I only lose 1 stop but my range goes up to 448mm and ends up being faster and longer than the f/2.8 losing 2 stops with the 2xTC 400mm.

Does that math make sense or am I not multiplying correctly?
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