I am not sure about the Sony range, but if you want to get up close and personal with these things (i.e. check out the minute detail in their eyes) then you will have to look for a dedicated macro lens. That is one that allows close focusing on a 1:1 basis. What are the Sony macro options and does the Sony accept a third party lens? If they accept third party I think the Sigma and Tamron range might be worth a look.
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