In the Render Setup Dialog, the same controls appear as in the Render Windows dialog with an additional number of controls which can be used to further refine your final gather setup.
A few points about final gather: ■
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When final gather is off your render will proceed quicker, but your shadows will generally be very dark. Turning on final gather will lighten shadows and produce indirect illumination automatically. The more bounces you use the better the effect, although more than 3 bounces and the increased effect is barely noticeable. Finally the precision of the calculation is generally set to draft until you are ready to do a final render. Settings of low to medium are common even at final render stages.
Chapter 9: Lighting