I took the following shots by reversing a Canon 50MM 1.8 lens with a Sigma
28-80 3.5-80 Lens. The Canon is used as a giant magnifying glass.
Here is a picture of the setup for the shots:
Here are the macro shots.
The depth of field for these types of shots is RAZOR thin.
Notice that George is just a hair out of focus.
I took this one without the Canon taped to the Sigma to
demonstrate the difference in the effect.