105mm f 4 Micro-Nikkor with PN-11 extension tube. The PN-11 extension allows for a 1:1 magnification ratio (image size equal to actual size). It has a tripod mount allowing for better balance and lets you shift from a vertical to horizontal format easily. The greater focal length allows for good closeups without having to get too close to the subject. I used this lens with real good results in photographing butterflys in the Winged Wonders exhibit at the zoo.