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      07-12-2011, 05:31 PM   #39
UdubBadger
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Drives: '04 330i ZHP
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2004 BMW 330i ZHP  [4.75]
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Quote:
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.
Quote:
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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