Here we have explored the use of Motion blur and Depth of Field within Maya Software and Mental Ray.
Motion blur can be useful in adding to the believability of movement as demonstrated with the jet planes below.
However, it can significantly increase render times and should thus only be used when appropriate to the scene. The image below demonstrates the difference between Maya Software motion blur to Mental Ray's motion blur, with the latter added another minute to fully render. Switching from 'Scanline' to 'Rapid Motion' (rasterizer) in Mental Ray can help reduce render time while keeping desirable results.
Depth of Field
Depth of field can be achieved with Maya's cameras to simulate real-world cameras in focusing on specific subjects. Again, this increases overall render time where Zdepth render layers could be used instead to simulate depth of field in compositing.