2n10 said:Lee Jay said:Khalai said:Lee Jay said:rrcphoto said:you're really not comparing this to the 200-400/4 are you?![]()
Why not? It's only one stop of difference. The 100-400 has the 100-200 range while the 200-400 has the built-in TC. I'd bet the optics are similar and that it would be really hard to tell the difference between them at the same focal length.
I'd say "it's a WHOLE stop of difference". Night and day in those focal lengths. Compare 300/2.8 and 300/4 or 200/2 and 200/2.8 - there is also "only" one stop difference, yet there is quite surprising PRICE difference![]()
Yes, and that's one reason I find Canon superteles so hugely overpriced.
Compare a 70-200/4L IS and a 70-200/2.8L IS and you'll see a difference that I think is much more justified than the difference between a 300/4L IS and a 300/2.8L IS or a 100-400L IS and a 200-400/4L IS.
A lot of that price difference has to do with the size of the optics. It costs much more than 2X the $ to make a lens that is 2x the diameter. You have a much greater volume of high quality lens glass and a much longer time of grinding it to tolerance.
And that is even more true for fluorite elements.
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