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Doug,
I've heard the 100f2 is very slightly better than the 85 f1.8 (a number of people on the digital_astro list have commented about this, I don't actually have either lens). Between the 100f2 and 100f2.8, if you didn't have a requirement for macro I would problably go with the 100 f2. Although the 100f2.8 is very sharp, it is quite a long bulky lens (its nearly the size of the 200 f2.8).
Terry
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