For dragonflies you need at least 200mm on FF so about 150mm on APS in my experience. I have had success with a 105mm lens on FF with dragonflies, but it is hard work. 200mm on APS is so much easier.
The Nikon 60mm micro lens is quite something. I compared it to my modest but well reviewed 24-85 AFS zoom at 60mm and F11, subject distance about 2m, and the micro lens gave noticeably higher contrast and sharpness. When stopped down, zooms often match primes. It is my favourite lens as the optics are so good.
Leif
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