Re: Primes vs. Zooms: Unusable Sharpness?

[Peter Spiro]

There are some differences apparent, especially at the edges, even with the 
Pentax 28-70 f/4 AL, which is one of the best zooms around.

An example of this can be seen at 
http://ca.geocities.com/spirope/infinitytest.htm

Other zooms perform considerably worse than this.  I used to have a 35-80, 
and it was really soft at the edges.
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