There are several out there. The 60mm f/2.8 is sharp but does not permit much space between you and your subject. The 105mm f/2.8 in VR or the recently discontinued non-VR versions seem to be the most in demand. It gives you an outstanding image with a little breathing room from your subject. Some say the non-VR is a little sharper than the newer version. Both seem very sharp and clear to me. A high priced option is the 200mm Micro from Nikkor, but it is pricey. There are also some cheaper options, the MF 55mm 2.8 Micro was tack sharp. I have a 30 y.o. copy that is very sharp. That, and maybe an extension ring will get the job done. As has been discussed recently in another (current) thread, a reversed 50mm normal lens will give you great macro results. If you already have a good prime lens, then you only need a reversal ring to be in business. There are a lot of options out there. Have fun!