Re: EOS Sharpness of 300 mm f4 IS vs. non IS

[canon]

Ray Amos wrote:
>According to Photodo, the optics of the 100-400 IS @ 300 is the same as
>the optics of the 300 f/4 IS lens.  So you don't lose anything and you
>gain the versatility of a 100-400 zoom that is very sharp through out
>it's range.  It has even closer macro capability because you can zoom
>out to the 400mm end.  It is really a great all around, all purpose
>lens.  It's not that much more expensive than the 300 f/4 IS.

What's the maximum aperture @300mm for the 100-400 IS? Is it f/4?

-Will
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