Originally Posted by Chewy734
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
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?