Cool, I have a set of extensions around here somewhere but I got terrible vignetting with them so I have only used them once.
I first starting doing macro with my D5100 and a Nikor 55-300 Telephoto. Once I decided that I really like macro photography I bought the Nikor 40mm f2.8 micro lens. So the majority of my macro photography is done with the micro lens today.
Cheers,
@kellyjanderson
I had my eye on the 100mm 2.8 type of macro lens sometime back but never got around to buying a dedicated macro lens as I don't shoot macro all that often. Would be interesting to compare magnification and quality of shots between the different systems.