Thanks Dennis for your explanation how you achieved in obtaining these beautiful macro images.
I agree that some of Canon's less expensive lenses(non L) can be just as good in producing very sharp photos.
I recently bought a Canon 50mm f 1.4 lens. It has a very plastic feel, but is unbelievably sharp and 1/3 of the price of the L series equivalent.
Needed the lens for a special indoor wedding and were not allowed using a flash.
cheers,
Peter