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

[Ray Amos]

Dave Herzstein 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....
> 
> Not according to current Canon literature:
> 300 f/4 IS:    15 elements in 11 groups
> 100-400 IS:    17 elements in 14 groups

Dave,

I'm sorry.  I meant sharpness and contrast.  I used the wrong word.  The
MTF graph of the 100-400 @ 300 is the same as the 300 IS at the same f
stop.  In other words, the resulting images created by each lens should
be practically indistinguishable from the other.

Ray Amos
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