Thanks so far for the responses. After reading your replies and reading up a bit more about macro photography, I'm torn between either a Sigma 50mm +SB-600, or a longer macro lens maybe the sigma 70mm or tamron 90mm, or maybe even the original idea for the tokina 100mm. What's wrong with the Sigma 50mm autofocus? Is it just slow, or are there other problems?
I already have a tripod, so that's not a problem. But I wonder, some people I've talked to recommend multiple SB-600 or a ring flash so you can avoid unisightly shadows. At this time anything more than a single SB-600 is out of my budget, so I may just forego the light and see what I can do with natural light. Although, a speedlight is nice to have for other purposes aside from macro.... hmm..
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