Well, the key is stacking. That's the part I find amazing.Wow!! this shot is superb. What lens set up did you use to get such clarity? All I have is a Canon 70-200mm L f/2.8 and I can only get so much detail and its really nothing compared to yours, very, very, well done!
Jake
I used a 600mm mirror lens that's really average and stacked about 12 shots with Registax.