Sigma 70-200/2.8 (non DG non macro version)

[Joseph Tainter]

How is that lens on digital (K10D) and whatwould it worth?

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I have the older, non-DG version. It has given me very nice results on 
my *ist D. I have not yet tried it on my K10D, but I expect it will 
perform well on that body too. It is a well respected and very sharp lens.

The older, non-macro version is sharper at 200 mm than is the new, macro 
version (which is not yet available in Pentax mount anyway).

Joe