I was able to play around with a Nikon 105/2.8 VR macro lens today. I thought the AF was terrible for normal shots, but the macro performance was really amazing and it also produces some of the nicest bokeh I have seen from a lens. This first shot was shot using the lens and 36mm Kenko macro tube stacked onto it. We set up a flash just to the left of the lens in Commander Mode. It is incredibly difficult to get the iris in focus, you will need many tries! I also recommend shining an LED light into your subjects eye to help aid you when you manually focus the lens, which is a must. It also helps to bring out the iris by using a gel on your flash that is the same color as the iris you are shooting.
PS- If you don’t want your blood vessels to grow out towards the outside of your eye, don’t wear your daily wear contacts for 3 weeks straight before taking them out. Stupid kids!
Here is some of that creamy-dreamy bokeh I was talking about. This shot was without the macro tube.