Rhino Tip - saving z-buffer data

This works differently than it does in the 3ds Max verion, and it just came up in the Rhino newsgroup, so I thought it was worth a mention here:

Question: Is there a way for Brazil to make an output of a depth map to use it with
DOF pro?

Answer: Once you've rendered, switch to "Z buffer" mode in the render window. You
can now press the "Save" button to save it.