[EMAIL PROTECTED] wrote:
>
> 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***************************************************
I would guess slightly under f/5.6. The lens has a variable aperture
from f/4.5 - f/5.6. All three lenses discussed are approx. the same
size and weight.
Ray Amos
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