I'm looking to buy a macro lense for my wife, who is an enthusiast/hobby photographer. Her camera body is a D7000, and she has a full suite of lenses other than a dedicated macro. I know nothing about photography, not even what an f stop is, so was wondering if someone could advise me on what I should look for, either a specific model, or specs in general. She'll probably shoot flowers and plants, along with small reptiles and amphibians around the garden (she hates bugs). My budget is about $500 Cdn (so currently under $9.99 US 😀). Seriously, about $400 US max.