This lens suprises me...works far better with natural light than with flash, IMHO,...I was quite pleased by the dof on this...the 100mm Macro will give you the shallowest of all I think...add a close up or a +2-+4 and you will get even more...
This seems to have considerable dof for 1.8.
I have the 50mm 1.8 with close up filters. Perhaps I should give them a whirl.
Perhaps, I should hurry up and buy the D-20
:)