DIY is alweys fun. There was a time when I wanted to go in for macrophotography, but I had no many for normal lens. Then I found this
It was a funny decision and I decided to try it. I made this thing and began to test it. My Nikkor 18-105 mm and 35 mm gave so high zoom that I didn't understand what I'm trying to focuse on. I wanted to make a macro shot of human eye, but I couldn't find it through viewfinder. It was really fun) So I hope you with help of this video you will made an incredible macro. My problem is that I didn't find a lens, that I could use in such system, but system is workable. So try it and post here your results.