DoF Research

This is taken out of a book called Learning Autodesk Maya 2008 The Special Effects book;

Depth of field is a photographic effect in which objects within a certain range of distance remain sharply focused. Objects outside this range appear out of focus. You can simulate this using the camera's Depth of Field attribute. This is not a post-process effect in mental ray, but true depth of field.

Ther are 3 settings under depth of field, i played around with the distance attribute apparently i was partly wrong and i should be looking at the F Stop attribute i did so and below are 4 images with the distance 80,60,40 and 20.(in decending order?) I think more blur may be needed in the far away shots as the detail will be lower.