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I think a macro lens is very much needed for any shot of this type. Anyway it's right what the others said about the depth of field and so on. It's not simple to make great macro shots, but they're very rewarding if done properly!
I personally use a Sigma 105mm, and I think is very good. Consider that with a 105mm you can see a rose at full view, so i don't think you need more if is not necessary to get some abstracts.
Have a nice time!
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