Sigma 70-200 f2.8 questions

Started Jun 10, 2010 | Discussions thread
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Coby
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Sigma 70-200 f2.8 questions
Jun 10, 2010

I am considering buying a Sigma 70-200mm f/2.8 II EX DG APO Macro HSM AF Lens for use on a K-x and K-7, and would appreciate some advice.

1) Do we know yet how the IQ compares with Sigma's newer OS version (at nearly twice the price)?

2) If I gave a IQ score of, say, 10 to the DA* 60-250, what score would you give to the Sigma? How about for focussing speed and accuracy, compared with the DA*?

3) How well does the Sigma 1.4x DG EX APO Teleconverter work with this lens? I read one post saying focus was unaffected but edges became softer - if so, is the TC worthwhile, vs. simply cropping the image?

Thanks in advance.

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